Extracting Constellation from RA/Dec

Dear group,

Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

Thanks in advance!

Anthony.

"Anthony Ayiomamitis" wrote in message
...
Dear group,

Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

Thanks in advance!

It's not online, but Google Earth has a Google Sky view with which you can
do this. However, you need to go into the Backyard Astronomy Layer and tick
the Constellation Boundaries option to make it easy to work out which
constellation you are in.

On Sep 26, 8:21*am, Anthony Ayiomamitis wrote:
Dear group,

Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

http://vizier.u-strasbg.fr/vizier/Vi...llations.htx#q

- Canopus56

P.S. - I havenot run across any code samples to derive a function in
Java or VBA.

On Sep 26, 10:12*am, canopus56 wrote:
On Sep 26, 8:21*am, Anthony Ayiomamitis wrote:
Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

Also of interest: you can also download the constellation boundary
line points from VizieR catalogue VI/49 at:

http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=VI/49

I havenot found a way to use the VizieR search form for catalogue VI/
49 to return a simple constellation list. - C

On Sep 26, 10:12*am, canopus56 wrote:
On Sep 26, 8:21*am, Anthony Ayiomamitis wrote:
Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

P.P.S. Looks like there is a separate Simbad catalogue that includes
data and sample code in C for determining the constellation directly
from position:

http://cdsarc.u-strasbg.fr/viz-bin/Cat?VI/42

- Canopus56

On Fri, 26 Sep 2008 07:21:44 -0700 (PDT), Anthony Ayiomamitis
wrote:

Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

If you want to do it locally, here's the code I wrote years ago:
www.cloudbait.com/misc/constel.zip
_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

On 26 Óåðô, 20:00, Chris L Peterson wrote:
On Fri, 26 Sep 2008 07:21:44 -0700 (PDT), Anthony Ayiomamitis

wrote:
Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

If you want to do it locally, here's the code I wrote years ago:www.cloudbait.com/misc/constel.zip
_________________________________________________

Chris L Peterson
Cloudbait Observatoryhttp://www.cloudbait.com

Chris et al,

Thank you for the overwhelming response and assistance.

Quite often we read something with a reference to a star (ex. SDSS
J012345.67+987653.21) and it is a little frustrating with TheSky and/
or SkyMap Pro locating the constellation so as to see if it is
seasonal or not etc.

A case in point is a project I have surrounding hypervelocity stars
and where seven such stars were added to the existing list of ten
stars. I spent some time doing grunt work identifying the
constellation for these new stars.

Thanks again!

Anthony.

On Sep 26, 7:40*pm, Anthony Ayiomamitis wrote:
On 26 Óåðô, 20:00, Chris L Peterson wrote:

On Fri, 26 Sep 2008 07:21:44 -0700 (PDT), Anthony Ayiomamitis

wrote:
Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

If you want to do it locally, here's the code I wrote years ago:www.cloudbait.com/misc/constel.zip
_________________________________________________

Chris L Peterson
Cloudbait Observatoryhttp://www.cloudbait.com

Chris et al,

Thank you for the overwhelming response and assistance.

Quite often we read something with a reference to a star (ex. SDSS
J012345.67+987653.21) and it is a little frustrating with TheSky and/
or SkyMap Pro locating the constellation so as to see if it is
seasonal or not etc.

A case in point is a project I have surrounding hypervelocity stars
and where seven such stars were added to the existing list of ten
stars. I spent some time doing grunt work identifying the
constellation for these new stars.

Thanks again!

Anthony.

I suppose this is what they now call a 'coming out' event where you
announce your astrological leanings based on a celestial sphere/
constellation framework and I welcome this development and encourage
others to freely discuss their magnification hobby without fear or
without guilt.

Chris has already stated his intentions by openly reasoning that there
is an external reference for daily rotation through 360 degrees even
though there are no astronomical precedents,structural or
timekeeping,for such a premise or conclusion.You have your 'wandering
Sun' analemma based on the same Ra/Dec framework and the sidereal time
reasoning behind it so obviously you both,along with the rest here,
are moving in the same direction.

I can't say it helps the wider population in matters such as
climatology and how the celestial input transfers to the terrestrial
consequences,not just long term effects but even the basic seasonal
experiences such as why we experience daylight/darkness
variations.Chris has a Caltech address attached to his name so
although there is nothing stopping people from delving into the
matter,the sheer weight of institutional support will act to keep the
door firmly shut on a very important modification based on orbital
specifics,as important as the modification of Kepler.

One thing may help - the separate motions of the Earth cannot be
transcribed into a single code and this is why there is an abundance
of software closely tied to the Ra/Dec system insofar as that
framework is basically the calendar system overlaid on a celestial
sphere framework,something like this -

http://www.opencourse.info/astronomy...phere_anim.gif

What programmers can do is distinguish between the separate motions
using the venerable noon cycle but that takes experience and a feel
for why the noon cycles vary whereas the Ra/Dec crowd judge the noon
cycles to be always 24 hours -

http://en.wikipedia.org/wiki/Image:T...sidéreo.en.png

Again,good to see you overcome your reticence about posting on
astrological affairs and I mean that.

In article ,
canopus56 wrote:
On Sep 26, 8:21=A0am, Anthony Ayiomamitis wrote:
Dear group,

Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

http://vizier.u-strasbg.fr/vizier/Vi...llations.htx#q

- Canopus56

P.S. - I havenot run across any code samples to derive a function in
Java or VBA.

Here's some old C code of mine which does just that. I think it's
quite easy to rewrite in Java if you want. It compiles directly as
C++:



/*

constell.c

Program to find in which constellation an RA/Dec position is

Adapted from CONST.FOR by Paul Schlyter, 1989-10-08

Re-arranged 1989-12-31

*/




enum constell {
And, Ant, Aps, Aqr, Aql, Ara, Ari, Aur, Boo, Cae, Cam,
Cnc, CVn, CMa, CMi, Cap, Car, Cas, Cen, Cep, Cet, Cha,
Cir, Col, Com, CrA, CrB, Crv, Crt, Cru, Cyg, Del, Dor,
Dra, Equ, Eri, For, Gem, Gru, Her, Hor, Hya, Hyi, Ind,
Lac, Leo, LMi, Lep, Lib, Lup, Lyn, Lyr, Men, Mic, Mon,
Mus, Nor, Oct, Oph, Ori, Pav, Peg, Per, Phe, Pic, Psc,
PsA, Pup, Pyx, Ret, Sge, Sgr, Sco, Scl, Sct, Ser, Sex,
Tau, Tel, Tri, TrA, Tuc, UMa, UMi, Vel, Vir, Vol, Vul,
NotFound = -1
};


#define Ser_Caput Ser
#define Ser_Cauda Ser



/* Table of IAU constellation boundaries. Equinox: 1875.0 */


static struct constbor
{
float RA_lower, RA_upper, decl;
enum constell con;
} constbor[] =
{
0.0000f, 24.0000f, 88.0000f, UMi,
8.0000f, 14.5000f, 86.5000f, UMi,
21.0000f, 23.0000f, 86.1667f, UMi,
18.0000f, 21.0000f, 86.0000f, UMi,
0.0000f, 8.0000f, 85.0000f, Cep,
9.1667f, 10.6667f, 82.0000f, Cam,
0.0000f, 5.0000f, 80.0000f, Cep,
10.6667f, 14.5000f, 80.0000f, Cam,
17.5000f, 18.0000f, 80.0000f, UMi,
20.1667f, 21.0000f, 80.0000f, Dra,
0.0000f, 3.5083f, 77.0000f, Cep,
11.5000f, 13.5833f, 77.0000f, Cam,
16.5333f, 17.5000f, 75.0000f, UMi,
20.1667f, 20.6667f, 75.0000f, Cep,
7.9667f, 9.1667f, 73.5000f, Cam,
9.1667f, 11.3333f, 73.5000f, Dra,
13.0000f, 16.5333f, 70.0000f, UMi,
3.1000f, 3.4167f, 68.0000f, Cas,
20.4167f, 20.6667f, 67.0000f, Dra,
11.3333f, 12.0000f, 66.5000f, Dra,
0.0000f, 0.3333f, 66.0000f, Cep,
14.0000f, 15.6667f, 66.0000f, UMi,
23.5833f, 24.0000f, 66.0000f, Cep,
12.0000f, 13.5000f, 64.0000f, Dra,
13.5000f, 14.4167f, 63.0000f, Dra,
23.1667f, 23.5833f, 63.0000f, Cep,
6.1000f, 7.0000f, 62.0000f, Cam,
20.0000f, 20.4167f, 61.5000f, Dra,
20.5367f, 20.6000f, 60.9167f, Cep,
7.0000f, 7.9667f, 60.0000f, Cam,
7.9667f, 8.4167f, 60.0000f, UMa,
19.7667f, 20.0000f, 59.5000f, Dra,
20.0000f, 20.5367f, 59.5000f, Cep,
22.8667f, 23.1667f, 59.0833f, Cep,
0.0000f, 2.4333f, 58.5000f, Cas,
19.4167f, 19.7667f, 58.0000f, Dra,
1.7000f, 1.9083f, 57.5000f, Cas,
2.4333f, 3.1000f, 57.0000f, Cas,
3.1000f, 3.1667f, 57.0000f, Cam,
22.3167f, 22.8667f, 56.2500f, Cep,
5.0000f, 6.1000f, 56.0000f, Cam,
14.0333f, 14.4167f, 55.5000f, UMa,
14.4167f, 19.4167f, 55.5000f, Dra,
3.1667f, 3.3333f, 55.0000f, Cam,
22.1333f, 22.3167f, 55.0000f, Cep,
20.6000f, 21.9667f, 54.8333f, Cep,
0.0000f, 1.7000f, 54.0000f, Cas,
6.1000f, 6.5000f, 54.0000f, Lyn,
12.0833f, 13.5000f, 53.0000f, UMa,
15.2500f, 15.7500f, 53.0000f, Dra,
21.9667f, 22.1333f, 52.7500f, Cep,
3.3333f, 5.0000f, 52.5000f, Cam,
22.8667f, 23.3333f, 52.5000f, Cas,
15.7500f, 17.0000f, 51.5000f, Dra,
2.0417f, 2.5167f, 50.5000f, Per,
17.0000f, 18.2333f, 50.5000f, Dra,
0.0000f, 1.3667f, 50.0000f, Cas,
1.3667f, 1.6667f, 50.0000f, Per,
6.5000f, 6.8000f, 50.0000f, Lyn,
23.3333f, 24.0000f, 50.0000f, Cas,
13.5000f, 14.0333f, 48.5000f, UMa,
0.0000f, 1.1167f, 48.0000f, Cas,
23.5833f, 24.0000f, 48.0000f, Cas,
18.1750f, 18.2333f, 47.5000f, Her,
18.2333f, 19.0833f, 47.5000f, Dra,
19.0833f, 19.1667f, 47.5000f, Cyg,
1.6667f, 2.0417f, 47.0000f, Per,
8.4167f, 9.1667f, 47.0000f, UMa,
0.1667f, 0.8667f, 46.0000f, Cas,
12.0000f, 12.0833f, 45.0000f, UMa,
6.8000f, 7.3667f, 44.5000f, Lyn,
21.9083f, 21.9667f, 44.0000f, Cyg,
21.8750f, 21.9083f, 43.7500f, Cyg,
19.1667f, 19.4000f, 43.5000f, Cyg,
9.1667f, 10.1667f, 42.0000f, UMa,
10.1667f, 10.7833f, 40.0000f, UMa,
15.4333f, 15.7500f, 40.0000f, Boo,
15.7500f, 16.3333f, 40.0000f, Her,
9.2500f, 9.5833f, 39.7500f, Lyn,
0.0000f, 2.5167f, 36.7500f, And,
2.5167f, 2.5667f, 36.7500f, Per,
19.3583f, 19.4000f, 36.5000f, Lyr,
4.5000f, 4.6917f, 36.0000f, Per,
21.7333f, 21.8750f, 36.0000f, Cyg,
21.8750f, 22.0000f, 36.0000f, Lac,
6.5333f, 7.3667f, 35.5000f, Aur,
7.3667f, 7.7500f, 35.5000f, Lyn,
0.0000f, 2.0000f, 35.0000f, And,
22.0000f, 22.8167f, 35.0000f, Lac,
22.8167f, 22.8667f, 34.5000f, Lac,
22.8667f, 23.5000f, 34.5000f, And,
2.5667f, 2.7167f, 34.0000f, Per,
10.7833f, 11.0000f, 34.0000f, UMa,
12.0000f, 12.3333f, 34.0000f, CVn,
7.7500f, 9.2500f, 33.5000f, Lyn,
9.2500f, 9.8833f, 33.5000f, LMi,
0.7167f, 1.4083f, 33.0000f, And,
15.1833f, 15.4333f, 33.0000f, Boo,
23.5000f, 23.7500f, 32.0833f, And,
12.3333f, 13.2500f, 32.0000f, CVn,
23.7500f, 24.0000f, 31.3333f, And,
13.9583f, 14.0333f, 30.7500f, CVn,
2.4167f, 2.7167f, 30.6667f, Tri,
2.7167f, 4.5000f, 30.6667f, Per,
4.5000f, 4.7500f, 30.0000f, Aur,
18.1750f, 19.3583f, 30.0000f, Lyr,
11.0000f, 12.0000f, 29.0000f, UMa,
19.6667f, 20.9167f, 29.0000f, Cyg,
4.7500f, 5.8833f, 28.5000f, Aur,
9.8833f, 10.5000f, 28.5000f, LMi,
13.2500f, 13.9583f, 28.5000f, CVn,
0.0000f, 0.0667f, 28.0000f, And,
1.4083f, 1.6667f, 28.0000f, Tri,
5.8833f, 6.5333f, 28.0000f, Aur,
7.8833f, 8.0000f, 28.0000f, Gem,
20.9167f, 21.7333f, 28.0000f, Cyg,
19.2583f, 19.6667f, 27.5000f, Cyg,
1.9167f, 2.4167f, 27.2500f, Tri,
16.1667f, 16.3333f, 27.0000f, CrB,
15.0833f, 15.1833f, 26.0000f, Boo,
15.1833f, 16.1667f, 26.0000f, CrB,
18.3667f, 18.8667f, 26.0000f, Lyr,
10.7500f, 11.0000f, 25.5000f, LMi,
18.8667f, 19.2583f, 25.5000f, Lyr,
1.6667f, 1.9167f, 25.0000f, Tri,
0.7167f, 0.8500f, 23.7500f, Psc,
10.5000f, 10.7500f, 23.5000f, LMi,
21.2500f, 21.4167f, 23.5000f, Vul,
5.7000f, 5.8833f, 22.8333f, Tau,
0.0667f, 0.1417f, 22.0000f, And,
15.9167f, 16.0333f, 22.0000f, Ser_Caput,
5.8833f, 6.2167f, 21.5000f, Gem,
19.8333f, 20.2500f, 21.2500f, Vul,
18.8667f, 19.2500f, 21.0833f, Vul,
0.1417f, 0.8500f, 21.0000f, And,
20.2500f, 20.5667f, 20.5000f, Vul,
7.8083f, 7.8833f, 20.0000f, Gem,
20.5667f, 21.2500f, 19.5000f, Vul,
19.2500f, 19.8333f, 19.1667f, Vul,
3.2833f, 3.3667f, 19.0000f, Ari,
18.8667f, 19.0000f, 18.5000f, Sge,
5.7000f, 5.7667f, 18.0000f, Ori,
6.2167f, 6.3083f, 17.5000f, Gem,
19.0000f, 19.8333f, 16.1667f, Sge,
4.9667f, 5.3333f, 16.0000f, Tau,
15.9167f, 16.0833f, 16.0000f, Her,
19.8333f, 20.2500f, 15.7500f, Sge,
4.6167f, 4.9667f, 15.5000f, Tau,
5.3333f, 5.6000f, 15.5000f, Tau,
12.8333f, 13.5000f, 15.0000f, Com,
17.2500f, 18.2500f, 14.3333f, Her,
11.8667f, 12.8333f, 14.0000f, Com,
7.5000f, 7.8083f, 13.5000f, Gem,
16.7500f, 17.2500f, 12.8333f, Her,
0.0000f, 0.1417f, 12.5000f, Peg,
5.6000f, 5.7667f, 12.5000f, Tau,
7.0000f, 7.5000f, 12.5000f, Gem,
21.1167f, 21.3333f, 12.5000f, Peg,
6.3083f, 6.9333f, 12.0000f, Gem,
18.2500f, 18.8667f, 12.0000f, Her,
20.8750f, 21.0500f, 11.8333f, Del,
21.0500f, 21.1167f, 11.8333f, Peg,
11.5167f, 11.8667f, 11.0000f, Leo,
6.2417f, 6.3083f, 10.0000f, Ori,
6.9333f, 7.0000f, 10.0000f, Gem,
7.8083f, 7.9250f, 10.0000f, Cnc,
23.8333f, 24.0000f, 10.0000f, Peg,
1.6667f, 3.2833f, 9.9167f, Ari,
20.1417f, 20.3000f, 8.5000f, Del,
13.5000f, 15.0833f, 8.0000f, Boo,
22.7500f, 23.8333f, 7.5000f, Peg,
7.9250f, 9.2500f, 7.0000f, Cnc,
9.2500f, 10.7500f, 7.0000f, Leo,
18.2500f, 18.6622f, 6.2500f, Oph,
18.6622f, 18.8667f, 6.2500f, Aql,
20.8333f, 20.8750f, 6.0000f, Del,
7.0000f, 7.0167f, 5.5000f, CMi,
18.2500f, 18.4250f, 4.5000f, Ser_Cauda,
16.0833f, 16.7500f, 4.0000f, Her,
18.2500f, 18.4250f, 3.0000f, Oph,
21.4667f, 21.6667f, 2.7500f, Peg,
0.0000f, 2.0000f, 2.0000f, Psc,
18.5833f, 18.8667f, 2.0000f, Ser_Cauda,
20.3000f, 20.8333f, 2.0000f, Del,
20.8333f, 21.3333f, 2.0000f, Equ,
21.3333f, 21.4667f, 2.0000f, Peg,
22.0000f, 22.7500f, 2.0000f, Peg,
21.6667f, 22.0000f, 1.7500f, Peg,
7.0167f, 7.2000f, 1.5000f, CMi,
3.5833f, 4.6167f, 0.0000f, Tau,
4.6167f, 4.6667f, 0.0000f, Ori,
7.2000f, 8.0833f, 0.0000f, CMi,
14.6667f, 15.0833f, 0.0000f, Vir,
17.8333f, 18.2500f, 0.0000f, Oph,
2.6500f, 3.2833f, -1.7500f, Cet,
3.2833f, 3.5833f, -1.7500f, Tau,
15.0833f, 16.2667f, -3.2500f, Ser_Caput,
4.6667f, 5.0833f, -4.0000f, Ori,
5.8333f, 6.2417f, -4.0000f, Ori,
17.8333f, 17.9667f, -4.0000f, Ser_Cauda,
18.2500f, 18.5833f, -4.0000f, Ser_Cauda,
18.5833f, 18.8667f, -4.0000f, Aql,
22.7500f, 23.8333f, -4.0000f, Psc,
10.7500f, 11.5167f, -6.0000f, Leo,
11.5167f, 11.8333f, -6.0000f, Vir,
0.0000f, 00.3333f, -7.0000f, Psc,
23.8333f, 24.0000f, -7.0000f, Psc,
14.2500f, 14.6667f, -8.0000f, Vir,
15.9167f, 16.2667f, -8.0000f, Oph,
20.0000f, 20.5333f, -9.0000f, Aql,
21.3333f, 21.8667f, -9.0000f, Aqr,
17.1667f, 17.9667f, -10.0000f, Oph,
5.8333f, 8.0833f, -11.0000f, Mon,
4.9167f, 5.0833f, -11.0000f, Eri,
5.0833f, 5.8333f, -11.0000f, Ori,
8.0833f, 8.3667f, -11.0000f, Hya,
9.5833f, 10.7500f, -11.0000f, Sex,
11.8333f, 12.8333f, -11.0000f, Vir,
17.5833f, 17.6667f, -11.6667f, Oph,
18.8667f, 20.0000f, -12.0333f, Aql,
4.8333f, 4.9167f, -14.5000f, Eri,
20.5333f, 21.3333f, -15.0000f, Aqr,
17.1667f, 18.2500f, -16.0000f, Ser_Cauda,
18.2500f, 18.8667f, -16.0000f, Sct,
8.3667f, 8.5833f, -17.0000f, Hya,
16.2667f, 16.3750f, -18.2500f, Oph,
8.5833f, 9.0833f, -19.0000f, Hya,
10.7500f, 10.8333f, -19.0000f, Crt,
16.2667f, 16.3750f, -19.2500f, Oph,
15.6667f, 15.9167f, -20.0000f, Lib,
12.5833f, 12.8333f, -22.0000f, Crv,
12.8333f, 14.2500f, -22.0000f, Vir,
9.0833f, 9.7500f, -24.0000f, Hya,
1.6667f, 2.6500f, -24.3833f, Cet,
2.6500f, 3.7500f, -24.3833f, Eri,
10.8333f, 11.8333f, -24.5000f, Crt,
11.8333f, 12.5833f, -24.5000f, Crv,
14.2500f, 14.9167f, -24.5000f, Lib,
16.2667f, 16.7500f, -24.5833f, Oph,
0.0000f, 1.6667f, -25.5000f, Cet,
21.3333f, 21.8667f, -25.5000f, Cap,
21.8667f, 23.8333f, -25.5000f, Aqr,
23.8333f, 24.0000f, -25.5000f, Cet,
9.7500f, 10.2500f, -26.5000f, Hya,
4.7000f, 4.8333f, -27.2500f, Eri,
4.8333f, 6.1167f, -27.2500f, Lep,
20.0000f, 21.3333f, -28.0000f, Cap,
10.2500f, 10.5833f, -29.1667f, Hya,
12.5833f, 14.9167f, -29.5000f, Hya,
14.9167f, 15.6667f, -29.5000f, Lib,
15.6667f, 16.0000f, -29.5000f, Sco,
4.5833f, 4.7000f, -30.0000f, Eri,
16.7500f, 17.6000f, -30.0000f, Oph,
17.6000f, 17.8333f, -30.0000f, Sgr,
10.5833f, 10.8333f, -31.1667f, Hya,
6.1167f, 7.3667f, -33.0000f, CMa,
12.2500f, 12.5833f, -33.0000f, Hya,
10.8333f, 12.2500f, -35.0000f, Hya,
3.5000f, 3.7500f, -36.0000f, For,
8.3667f, 9.3667f, -36.7500f, Pyx,
4.2667f, 4.5833f, -37.0000f, Eri,
17.8333f, 19.1667f, -37.0000f, Sgr,
21.3333f, 23.0000f, -37.0000f, PsA,
23.0000f, 23.3333f, -37.0000f, Scl,
3.0000f, 3.5000f, -39.5833f, For,
9.3667f, 11.0000f, -39.7500f, Ant,
0.0000f, 1.6667f, -40.0000f, Scl,
1.6667f, 3.0000f, -40.0000f, For,
3.8667f, 4.2667f, -40.0000f, Eri,
23.3333f, 24.0000f, -40.0000f, Scl,
14.1667f, 14.9167f, -42.0000f, Cen,
15.6667f, 16.0000f, -42.0000f, Lup,
16.0000f, 16.4208f, -42.0000f, Sco,
4.8333f, 5.0000f, -43.0000f, Cae,
5.0000f, 6.5833f, -43.0000f, Col,
8.0000f, 8.3667f, -43.0000f, Pup,
3.4167f, 3.8667f, -44.0000f, Eri,
16.4208f, 17.8333f, -45.5000f, Sco,
17.8333f, 19.1667f, -45.5000f, CrA,
19.1667f, 20.3333f, -45.5000f, Sgr,
20.3333f, 21.3333f, -45.5000f, Mic,
3.0000f, 3.4167f, -46.0000f, Eri,
4.5000f, 4.8333f, -46.5000f, Cae,
15.3333f, 15.6667f, -48.0000f, Lup,
0.0000f, 2.3333f, -48.1667f, Phe,
2.6667f, 3.0000f, -49.0000f, Eri,
4.0833f, 4.2667f, -49.0000f, Hor,
4.2667f, 4.5000f, -49.0000f, Cae,
21.3333f, 22.0000f, -50.0000f, Gru,
6.0000f, 8.0000f, -50.7500f, Pup,
8.0000f, 8.1667f, -50.7500f, Vel,
2.4167f, 2.6667f, -51.0000f, Eri,
3.8333f, 4.0833f, -51.0000f, Hor,
0.0000f, 1.8333f, -51.5000f, Phe,
6.0000f, 6.1667f, -52.5000f, Car,
8.1667f, 8.4500f, -53.0000f, Vel,
3.5000f, 3.8333f, -53.1667f, Hor,
3.8333f, 4.0000f, -53.1667f, Dor,
0.0000f, 1.5833f, -53.5000f, Phe,
2.1667f, 2.4167f, -54.0000f, Eri,
4.5000f, 5.0000f, -54.0000f, Pic,
15.0500f, 15.3333f, -54.0000f, Lup,
8.4500f, 8.8333f, -54.5000f, Vel,
6.1667f, 6.5000f, -55.0000f, Car,
11.8333f, 12.8333f, -55.0000f, Cen,
14.1667f, 15.0500f, -55.0000f, Lup,
15.0500f, 15.3333f, -55.0000f, Nor,
4.0000f, 4.3333f, -56.5000f, Dor,
8.8333f, 11.0000f, -56.5000f, Vel,
11.0000f, 11.2500f, -56.5000f, Cen,
17.5000f, 18.0000f, -57.0000f, Ara,
18.0000f, 20.3333f, -57.0000f, Tel,
22.0000f, 23.3333f, -57.0000f, Gru,
3.2000f, 3.5000f, -57.5000f, Hor,
5.0000f, 5.5000f, -57.5000f, Pic,
6.5000f, 6.8333f, -58.0000f, Car,
0.0000f, 1.3333f, -58.5000f, Phe,
1.3333f, 2.1667f, -58.5000f, Eri,
23.3333f, 24.0000f, -58.5000f, Phe,
4.3333f, 4.5833f, -59.0000f, Dor,
15.3333f, 16.4208f, -60.0000f, Nor,
20.3333f, 21.3333f, -60.0000f, Ind,
5.5000f, 6.0000f, -61.0000f, Pic,
15.1667f, 15.3333f, -61.0000f, Cir,
16.4208f, 16.5833f, -61.0000f, Ara,
14.9167f, 15.1667f, -63.5833f, Cir,
16.5833f, 16.7500f, -63.5833f, Ara,
6.0000f, 6.8333f, -64.0000f, Pic,
6.8333f, 9.0333f, -64.0000f, Car,
11.2500f, 11.8333f, -64.0000f, Cen,
11.8333f, 12.8333f, -64.0000f, Cru,
12.8333f, 14.5333f, -64.0000f, Cen,
13.5000f, 13.6667f, -65.0000f, Cir,
16.7500f, 16.8333f, -65.0000f, Ara,
2.1667f, 3.2000f, -67.5000f, Hor,
3.2000f, 4.5833f, -67.5000f, Ret,
14.7500f, 14.9167f, -67.5000f, Cir,
16.8333f, 17.5000f, -67.5000f, Ara,
17.5000f, 18.0000f, -67.5000f, Pav,
22.0000f, 23.3333f, -67.5000f, Tuc,
4.5833f, 6.5833f, -70.0000f, Dor,
13.6667f, 14.7500f, -70.0000f, Cir,
14.7500f, 17.0000f, -70.0000f, TrA,
0.0000f, 1.3333f, -75.0000f, Tuc,
3.5000f, 4.5833f, -75.0000f, Hyi,
6.5833f, 9.0333f, -75.0000f, Vol,
9.0333f, 11.2500f, -75.0000f, Car,
11.2500f, 13.6667f, -75.0000f, Mus,
18.0000f, 21.3333f, -75.0000f, Pav,
21.3333f, 23.3333f, -75.0000f, Ind,
23.3333f, 24.0000f, -75.0000f, Tuc,
0.7500f, 1.3333f, -76.0000f, Tuc,
0.0000f, 3.5000f, -82.5000f, Hyi,
7.6667f, 13.6667f, -82.5000f, Cha,
13.6667f, 18.0000f, -82.5000f, Aps,
3.5000f, 7.6667f, -85.0000f, Men,
0.0000f, 24.0000f, -90.0000f, Oct,
0.0f, 0.0f, 0.0f, NotFound
};


/* RAh1875 = RA in hours, equinox B1875.0 = JD 240 5889.258 55 */
/* dec1875 = Decl in degrees equinox B1875.0 = JD 240 5889.258 55 */
enum constell which_const( double RAh1875, double dec1875 )
{
struct constbor *constb;

/*
Find constellation such that the declination entered is higher than
the lower boundary of the constellation when the upper and lower right
ascensions for the constellation bound the entered right ascension
*/
for( constb = constbor; constb-con = 0; constb++ )
{
if ( RAh1875 = constb-RA_lower &&
RAh1875 constb-RA_upper &&
constb-decl = dec1875 )
return constb-con; /* Constellation found */
}
return NotFound; /* Constellation not found */
} /* which_const */





--
----------------------------------------------------------------
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at stjarnhimlen dot se
WWW: http://stjarnhimlen.se/

On Sep 27, 2:43 am, (Paul Schlyter) wrote:
In article ,

canopus56 wrote:
On Sep 26, 8:21=A0am, Anthony Ayiomamitis wrote:
Dear group,

Is anyone aware of an online facility where a user would enter an RA
and Dec and he would be informed of the constellation matching those
coordinates?

http://vizier.u-strasbg.fr/vizier/Vi...llations.htx#q

- Canopus56

P.S. - I havenot run across any code samples to derive a function in
Java or VBA.

Here's some old C code of mine which does just that. I think it's
quite easy to rewrite in Java if you want. It compiles directly as
C++:
[...]

It's actually a subroutine, not a program. Need a main program to
call it. :-)

And before anyone translates it to Java, it'd be wise to read this:

http://java.sun.com/developer/Books/shiftintojava/page1.html

noting the comments about enums. :-)