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Moon Sighting for Muslim Festivals in 1427 - H
By Dr. Syed Abdul Zahir
Sighting of the hilal/crescent with the naked eye is farde kifaya meaning, a group of people in a small town or big cities should attempt to visualise the hilal.
Readers might have noted my Ramadan article exactly last year and by the grace of the Almighty all the dates I had predicted scientifically and Astronomically turned out to be cent % correct.
To remind the learned readers, in short, we should look for the crescent a few hours after the occurrence of the new moon – many of us mistake this word for a hilal, if so it would be a big mistake, since it is a totally dark black moon facing the earth while the other bright half faces the sun. It is similar to the fact when a microscopic embryonic hilal has developed whose incubation or gestation period is about 20 hours or more. As this phenomenon occurs, the disk of the moon keeps moving anti -clockwise from the west to the east continuously along its orbit at the rate of its own diameter (2160 miles) each hour or half a degree of its orbit. The moon completes one orbit in 29 days, 12 hours, 44 minutes and 2.8 seconds or 29.53 days. This means the length of a day on the moon is about 14 earth days and 16 hours and so also is the length of the night.
It has been observed mathematically that each hour about 6-6.5 miles more of the illuminated portion of the moon is seen from the earth depending upon whether the moon is in the perigee(shortest distance from the earth) or apogee(longest distance). When about 120 -125 miles of the illuminated disk of the moon faces the earth, may be at an age of about 20 hours plus, the chances of sighting the hilal are good.
Other criteria to be kept in mind are:
1. The moon set lag time from the sunset time should be about 50 minutes or more in the tropical region.
2. The age of the moon should be more than 20 hours.
3. Moon should be situated in the northern latitudes and would be visible later if situated in the south.
4. Would be visible later if the moon is situated in the apogee.
5. About 30-45 minutes after the evening twilight has set in.
I would like to remind the readers once again that the sighting of the hilal/crescent with the naked eye is farde kifaya meaning, a group of people in a small town and many groups in big cities should attempt to visualise the hilal and report to the local hilal committee.
Moon Sighting for Ramadan
The new moon or amavas for this month occurs on Friday, September 22, at 5:15 pm in India along with an annular solar eclipse (not seen in India). There are no chances of sighting the hilal this evening. The next day evening on Saturday even though the age of the moon would be 24 hours, the moon set lag would be just 25 minutes in central India as the moon is situated at its apogee and in the southern latitude as well, as such there are no chances of visibility in India. The next day the moon sighting occurs all over India and the world. Accordingly, inshallah Ramadan starts in India from Monday,
Moon Sighting for Eid-ul-Fitr(Shawaal)
The amavas or the new moon occurs on Sunday, October 22nd at 10:44 am. The moon continues to be at its apogee and in the southern latitude. Hence there are no chances of sighting the hilal even on the next day i.e., 23rd Monday as the moon set lag time is just 32 minutes in central India. On Thursday, October 24th the moon set lag time would be 72 minutes and the hilal would be seen in the evening and Eid would be inshallah celebrated in India on Wednesday, October 25th.
Tenth day of Zulhijja or Bakrid falls on the New Year day, i.e., January 1, 2007 that is Monday. Finally, our Islamic New Year day i.e., 1st day of Muharram 1428 Hijri falls on Sunday, January 21st.
The references to this original article have been obtained from the publications of:
1. The Positional Astronomy Center, Kolkata.
2. The International Islamic Calendar Program, Malaysia.
3. The Royal Greenwich Observatory, London.
(The writer is Member, International Islamic Calendar Program, Malaysia, Member Central Ruyath Hilal Committee, Bangalore and an Islamic Astronomer. Ph: 26636383/26636380. Email: abdul21@ hotmail.com).
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