Though the monsoon will still be active in September and we may expect a few showers, it is time to get ready for star gazing. The period soon after the rain can actually be very good for observations. The rain would have wash away the smog in the atmosphere; and the moist ground reduces the probability of dust being thrown into the atmosphere.
List of Events Sep h m 01 Su Venus: 5.2° E 02 Mo 15:48 Mars Conjunction 04 We 06:56 Mercury Superior Conj. 06 Fr 08:40 First Quarter 06 Fr 12:22 Moon-Jupiter: 2.4° S 08 Su 15:09 Moon South Dec.: 22.5° S 08 Su 19:23 Moon-Saturn: 0° 08 Su 23:05 Moon Descending Node 10 Tu 11:48 Neptune Opposition 13 Fr 19:02 Moon Apogee: 406400 km 14 Sa 10:03 Full Moon 20 Fr 21:44 Moon-Aldebaran: 2.8° S 22 Su 08:11 Last Quarter 23 Mo 07:24 Moon North Dec.: 22.7° N 23 Mo 12:00 Moon Ascending Node 23 Mo 13:19 Autumnal Equinox 25 We 02:45 Moon-Beehive: 0.4° S 28 Sa 07:57 Moon Perigee: 357800 km 28 Sa 23:56 New Moon
The autumnal equinox takes place on the 23rd at 7:24 IST. On this day the sun’s rays fall perpendicular to the axis of the Earth. This has led to the common misconception that on this day the duration of day and night are equal all over the Earth but that is not true. One can check this by noting down the rising and setting times of the Sun from the local newspapers.
The ‘equinox’ days for the four Indian metros are as follows: Delhi September 27; Kolkata September 28; Mumbai September 29; and Chennai October 02.