Moon

Hi,

single image with bresser messier R152/760

regards

josef

"Josef Büchsenmeister" wrote in news:4766c750
:



Yup, that's her. M-O-O-N that spells moon.

Josef:

Josef Büchsenmeister wrote:
Hi,
single image with bresser messier R152/760
regards
josef


I have no explanations, and I will probably be observing the Moon once I
get my own telescope out of the CAD computer and actually constructed. I
am planning a Newtonian with 10" diameter mirror and with a 60" focal
length that will be on an equatorial mount.

My question is this. The limb of the Moon of your image shows a shadow
line that shifts horizontally a great distance. That implies that
mountain ranges and crater rims are casting shadows. Several shadowy
areas don't seem to comply with the mountains and craters, and they
appear to me that some major differences in the ground elevation are
apparent.

What are the elevation differences that the shadows imply?

Are the mountains and elevation changes as great as 1 Kilometer?

Are there considerably greater height differences on the Moon than on
the Earth?

BTW, I've been using IrfanView image display software to view images.
What do you suggest?

BTW, where are you located?

Thanks for posting the interesting image.


Ralph Hertle
Edison, New Jersey, USA

The sun is directly overhead at the limb at half moon like this was
taken at, so there are no shadows there. Slopes on the moon are too
gentle for any to exist at noon except right at the poles and those are
cast toward the poles not us. Foreshortened natural dark features can
make such a line as can some sharpening routines. I'm really not sure
what feature you are talking about.

Now there are shadows that are well shown at the terminator (line
between day and night). Galileo was the first to measure those to get a
general idea of how high features were on the moon though its distance
wasn't well known then so his estimates were somewhat off. Some peaks
in the Apennine range reach about 5 km high and some craters can be that
deep as well. A web search should turn up all that info. Or knowing
the moon is 239,000 miles away and 2140 miles across you can estimate
the sun angle and calculate your own height estimates as Galileo did.

Rick

Ralph Hertle wrote:
Josef:

Josef Büchsenmeister wrote:

Hi,
single image with bresser messier R152/760
regards
josef



I have no explanations, and I will probably be observing the Moon once I
get my own telescope out of the CAD computer and actually constructed. I
am planning a Newtonian with 10" diameter mirror and with a 60" focal
length that will be on an equatorial mount.

My question is this. The limb of the Moon of your image shows a shadow
line that shifts horizontally a great distance. That implies that
mountain ranges and crater rims are casting shadows. Several shadowy
areas don't seem to comply with the mountains and craters, and they
appear to me that some major differences in the ground elevation are
apparent.

What are the elevation differences that the shadows imply?

Are the mountains and elevation changes as great as 1 Kilometer?

Are there considerably greater height differences on the Moon than on
the Earth?

BTW, I've been using IrfanView image display software to view images.
What do you suggest?

BTW, where are you located?

Thanks for posting the interesting image.


Ralph Hertle
Edison, New Jersey, USA

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

On Tue, 18 Dec 2007 22:51:55 GMT, Ergonaut
wrote:

"Josef Büchsenmeister" wrote in news:4766c750
t:



Yup, that's her. M-O-O-N that spells moon.

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