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| Object/type: | Moon / shadow on floor of Ptolemy crater |
| mag/dia/dist: | |
| constellation: | |
| date/time/place: | Jan 2, 2001 / 19:58 / bangkok |
| trans'y/seeing/l-poll: | |
| telescope: | Newtonian 4.5", f 8.8 |
| eyepieces/power: | 25mm,10mm / 40x,100x |
| sky atlas page: | |
On jan 2, 2001; 19:58 Hrs. I looked at moon at 40x, I found the rille of dark & bright
in one big crater. I changed to 100x and took a quick sketch as showed.
After I compared to moon map in "Touring the Universe through Binoculars"
,the crater is Ptolemy which the crater wall 3,048 m height. I realized that it is
shadow of mountain wall cast to the crater floor. It was very beautiful.
The moon age was 8 days, I try to observe on every months but haven't got them
as second time yet. Also, I surf to other web site, but can't found any record.
However, I found the best web site for
Moon sketching.
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