When to Observe Shawwal Waning (OLD) Crescent ?
The geocentric conjunction (Geocentric New Moon) will occur Inshalla on (Monday 20 November 2006) at
22:18 UT.
Sighting the OLD crescent on (Monday 20 November 2006) is shown in the below graph using the program Accurate Times by Mohammad Odeh according to Odeh criterion. Where:-
- It is impossible to see the OLD crescent from the areas located under the red color. Because either the Moon on this day rises after the Sunrise and/or the topocentric conjunction occurs before the Sunrise.
- The crescent is expected to be seen by optical aid only from the areas located under the blue color.
- The crescent is expected to be seen by optical aid from the areas located under the magenta color. In these areas the crescent could be seen by naked eye if the atmospheric conditions are superb and the observer is experienced.
- The crescent is expected to be easily visible by naked eye from the areas located under the green color.
- The crescent can not be seen from uncolored areas, even though the Moon rises in these locations before the Sunrise and the topocentric conjunction occurs after the Sunrise, but the Moon is not sufficiently illuminated in order to be seen as crescent even by optical aid.
- Kindly notice that the below graph shows the possibility of seeing the crescent from areas between 60 degrees north of Equator down to 60 degrees south of Equator.
Monday 20 November 2006
Shawwal Waning (OLD) Crescent Observation Results
Sunday 19 November 2006:
- Iran: ICOP member Mr. Alireza Mehrani mentioned that he was able to see the crescent by naked eyes.
Date: Sun Nov 19, 2006
Photographer: Alireza Mehrani
Location: Esfahan, Iran
Monday 20 November 2006:
- Kuwait: ICOP member Mr. Hussain Khushaish said: "In Kuwait at Kabad desert- far about 40 km from city - In the morning of Monday 20 nov 2006 I could not sight the crescent even with 20*60 binocular. The sky was very clear that I could see some meteors and seeing was very good that the stars did not twinkle to the last quarter from zenith. Only the eastern horizon upto 3~4 degrees was hazy. Actually I went to that place to observe the twilight, but I could not see the vertical twilight ( al fajer al katheb ) nor Mars and niether the crescent. I could confirm the astronomical twilight by visibility at 5:12 which is 19 minuts after the calculated twilight. So from this observing secession I conclude that to see with optical aid an 18h:29m age crescent with 34 minutes lag, 5:29 deg alt, 9:20 deg elong, 12 sec width, 0.67 % illum you need a perfect atmosphere conditions at the last 1 or 2 degrees above horizon which can be only available at altitudes of more than ~ 1000 meters or so or else the sighting would be improbable even with optical aid."