Can AU mean something other than Astronomical Units? Given this formula: (m1 + m2)T^2 = a^3 T=years m=solar masses a is in units of AU Can anyone guess what...

I am preparing a presentation on the Equation of Time and have been trying to find a clear description, preferable with diagrams, of the adjustment due to...

On Apr 28, 2:14*pm, Abo wrote: Sanny wrote: When Sun and Earth are attracting each other why do Earth not fall on Sun. It...

I need a table of values of the speed of orbit of the Earth and matching distance of the Earth from the Sun. Four values during the year should...

This one involving magnitude: If a star has a parallax of 0.1 seconds of arc, and an apparent magnitude of 3, what is its absolute magnitude? Apparently the...

Hi, We have recently been 'bought' a star and presented with a elaborate certificate from the International Star Registry. The star was bought in honor of...

CC: On Tue, 8 Apr 2008, amisb65 wrote: What you are about to read might sound unusual but it could be...

Hi folks, I've added a few new images taken from the UK with UK equipment under UK skies and added them to my 'recent images ' page. Not as high a standard as...

Ok, sorry to be so dense, but I don't understand this: Distance to a star whose parallax is 0.33 seconds of arc is about ____ light years. The answer is...

What is the simplest parallax equation for computing the distance to a star? I.e., one that, say, a highschool or middleschool student would use? Thanks.

The Messier Ten Minute Challenge M3 - Globular Cluster in Canes Venatici M3 (NGC 5272) is one of the most famous globular clusters, containing at least half...

The Messier Ten Minute Challenge M102 - Galaxy in Draco There are two views on the identity of M102. but on balance there is sufficient evidence that Méchain...

The Messier Ten Minute Challenge M6 - Open Cluster in Scopius The open cluster M6 (NGC 6405) is also known as the Butterfly Cluster. At a distance of about...

http://www.universetoday.com/2008/04/16/latest-news-on-apophis-13-year-old-boy-corrects-nasas-estimates-of-earth-impact/#more-13679

The Messier Ten Minute Challenge M54 - Globular Cluster in Sagittarius M54 (NGC 6715) is a particularly luminous globular cluster with a diameter of around...

As the second active region of the new cycle (#24) struggles to survive, a dramatic prominence display was visible today on the north-western limb....

The Messier Ten Minute Challenge M29 - Open Cluster in Cygnus The open cluster M29 (NGC 6913) lies at a distance variously quoted at anything between 4000...

Hi all, I uploaded a new wide field shots with film Kodak E200 to my homepage: www.danilopivato.com In the center of the field there is a parts more light...

UK space policy faces a major revamp with civil servants being moved out of London and stripped of some of their responsibilities. More at...

The Messier Ten Minute Challenge M107 - Globular Cluster in Ophiuchus Discovered by Méchain in 1782 M107 (NGC 6171) seems to contain some dark regions. This...