پــایــگــــــاه اطــــلاع رســـــانـــی هــــلال مـــــاه

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مکاتبه رد و بدل شده بين آقای عليرضا بوژمهرانی و جيمز استم در مورد رويت پذيری آخرين هلال صبحگاهی شوال و هلال شامگاهی ذيقعده

منبع: سایت کمان آسمانی

From: Alireza Mehrani

To: Jim Stamm

 

Dear Jim

 

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?

 

Alireza

 

 

Morning Crescent

Location: Esfahan (KOSAR Observatory) 32:47N 51:52E

TZ:+3.5

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    

 

Evening Crescent

Location: Shiraz (HOMAYJAN) 30:05N 52:06E

TZ:+3.5

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

moon.

 

Good luck, and let me know if I can be of more help.

 

-Jim

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