منبع: سایت کمان آسمانی
From: Alireza Mehrani
To: Jim Stamm
The record of the Iranian observer I had pointed out earlier has been got by means of an optical unit. Attached find the parameters of a morning and an evening crescent. Do you estimate that we can observe them by 15x80 binoculars?
Location: Esfahan (KOSAR Observatory) 32:47N 51:52E
Date: Thu 2 Jan 2003
Time: 7h 05m 06s LT
Moon Alt: 3.886 3d 53m 11s Moon Azi: 124.533 124d 31m 59s
Moon Dec: -26.150 -26d 09m 00s Moon RA: 18.222 18h 13m 21s
Sun Alt: -0.239 -0d 14m 19s Sun Azi: 117.041 117d 02m 29s
Sun Dec: -22.960 -22d 57m 35s Sun RA: 18.820 18h 49m 12s
Rel Alt: 4.125 4d 07m 30s Rel Azi: 7.492 7d 29m 30s
Elongation: 8.751 8d 45m 03s Moon Age: -16.79h -0D 16H 48M
Phase:0.0066 Mag: -4.90 Width:0.19m Semi-Diam:0.267 Distance:372725.60km
Moon Rise: 6h 38m 22s LT Azimuth: 120d 55m 20s
Moon Set: 16h 36m 55s LT Azimuth: 238d 45m 46s
Sunrise-Moonrise: -0h 26m 44s Sunset-Moonset: -0h 30m 46s
Location: Shiraz (HOMAYJAN) 30:05N 52:06E
Date: Fri 3 Jan 2003
Time: 17h 13m 49s LT
Moon Alt: 4.896 4d 53m 47s Moon Azi: 236.492 236d 29m 32s
Sun Alt: -0.238 -0d 14m 18s Sun Azi: 243.897 243d 53m 51s
Rel Alt: 5.135 5d 08m 05s Rel Azi: -7.405 -7d 24m 19s
Elongation: 9.260 9d 15m 37s Moon Age: 17.35h 0D 17H 21M
Phase:0.0074 Mag: -4.96 Width:0.21m Semi-Diam:0.264 Distance:378124.26km
Sunrise-Moonrise: 0h 32m 11s Sunset-Moonset: 0h 31m 28s
From: Jim Stamm
To: Alireza Mehrani
You do not give me the elevation above sea level of the observatory. I
assume it is about 1000 meters, and that there are mountains blocking the
rising sun from the east.
This looks like it will be difficult, but possible, if the atmospheric
conditions are very good. I would mount my binoculars on a tripod, and
set them on Theta Ophiuchi somewhere around 6:00 a.m. Focus them
carefully, and calculate the time that the moon will go through the
field. Then look for the crescent just 1 degree lower in declination.
I made the same assumptions as above for elevation and western horizon.
This is only a little bit easier (Or maybe I should say "Not quite as
hard as the morning crescent.")
It is more difficult to point in the correct direction in the evening,
and that is very critical. Sweeping can easily miss the crescent. (Am I
correct in assuming that it is proper to use the term Hilal only after
the crescent is sighted?) You have Mercury sitting about 9 degrees above
the moon, and 1.5 degrees to it's west (local alt/az orientation). You
can use that to focus and drop down to a more precise direction for the
Good luck, and let me know if I can be of more help.
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