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پاسخ پروفسور برنارد يالوپ به گزارش ارسالی آقای عليرضا بوژمهرانی در خصوص رصد هلال رمضان

منبع: سایت کمان آسمانی

From: Alireza Mehrani

To: Prof. Bernard Yallop

CC: Mohammad Odeh

 

Dear Prof. B. Yallop

 

Whit greetings from sunny Esfahan!

These are some points about Moon Crescent Observation I gathered during sunset on Tuesday November 5, 2002 in north of Shiraz. The location of observation had the latitude of 30:05 and longitude of 52:06 with the elevation of 2200 meters.  The altitude of the mountains in the west horizon was 0.5 degree. I had drowned the visibility line of the crescent with the optic tools on the map of the Iran (with the scale of 1:1000000). My location was 7 km north of this line, and the amount of "q" parameter at this point and at the "best time" was -0.233. The sky in the west horizon was covered with thin and compact layers of clouds. These layers of clouds had made parallel lines with horizon. The sky of the west horizon was totally clear in two parts. One of them was in the altitude of 6 degree and the other in the altitude 3 degree. During the sunset, the crescent was in the upper clear part. But due to the light of the sun it was not observable. It was 22 minutes after the sunset when I observed the crescent it the lower clear part. I was using the 12x70 binoculars. What made me surprised was the fact that despite my presupposition I found this crescent easily; and if the sky was not cloudy, I could observe sooner after the sunset. Moreover, I was confident if I had moved more towards north from the visibility line I had drawn based on your criterion, I would have been able to observe this crescent with the same binoculars or more powerful ones such as 20x120 and 40x150. In Iran, one of my friends in Shiraz too was able to observe the crescent using 20x50 binoculars. However, the amount of "q" for his location was -0.228 which is based on your criterion in visibility location with optic tools. I hope that this report will be useful/applied for you.

 

 

From: Bernard Yallop

To: Alireza Mehrani

Subject: Your latest Crescent Moon Observation

 

Dear Alireza

 

Greetings from rainy old England!

 

You must have some wonderful skies.   Your observations are highly valuable.

I am hoping to get a letter published in The Observatory Magazine in the

next month or two.   I would like to report your observations.

 

I shall contact one of the Editors and a colleague of mine regarding what to

say.   I will try to work out a strategy.   There have been some

professional astronomers reporting early sightings, which break the Danjon

limit.   I have a suspicion that their observations are false.

 

Best wishes

 

Bernard Yallop

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