21st September....Autumn Equinox for the Northern Hemisphere...( See Weather Report Below the Article)
Seasons are opposite on either side of the equator, so the equinox in September is also known as the "autumnal (fall) equinox" in the northern hemisphere. However, in the southern hemisphere, it's known as the "spring (vernal) equinox".
There are two equinoxes every year – in September and March – when the sun shines directly on the equator and the length of day and night is nearly equal.
The Earth's axis is always tilted at an angle of about 23.5° in relation to the ecliptic, the imaginary plane created by the Earth's path around the Sun. However, the tilt's orientation changes throughout the year. On any other day of the year, the Earth's axis tilts a little away from or towards the Sun. But on the two equinoxes, the Earth's axis tilts neither away from nor towards the Sun and is perpendicular to the Sun's rays, like the illustration shows.
Why is it called equinox?
On the equinox, night and day are nearly exactly the same length – 12 hours – all over the world. This is the reason it's called an "equinox", derived from Latin, meaning "equal night". However, even if this is widely accepted, it isn't entirely true. In reality equinoxes don't have exactly 12 hours of daylight
At the equinoxes, the sun appears overhead at noon as seen from Earth’s equator.
That’s why the sun rises due east and sets due west for all of us. The sun is on the celestial equator, and the celestial equator intersects all of our horizons at points due east and due west.
The September equinox occurs the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from north to south. This happens either on September 22, 23, or 24 every year...It varies from place to place...
Although the equinox happens at the same moment worldwide, the clock times vary by time zone.
For example: September Equinox in India is on
Tuesday, 23 September 2014, 07:59 IST.
World on 21st September 2014:
The Hottest Place on 21st September 2014 was Sulaibiya in Kuwait and Ain Beida Airport in Algeria at 45c.
Highest Heat Index: 53.6c: Sirrri, Iran.
Maximum Pressure: 1082 mb at Eagle Range, UT, U.S.
Minimum Pressure: 978 mb at Nuuk, Greenland.
Hottest in India: Hissar 37.7c.
Hottest in Pakistan was Sibbi at 41c.
Hottest in Nepal: Bhairawa Airport: 34.5c.
The Weather Report:
The SWM had withdrawn from Pakistan and now from West Rajasthan and Kutch. Gradually withdrawing from Punjab and Rajasthan by 23rd.
The Low from the Bay has almost fizzled out and merged in the axis. The UAC remains over North Bengal and Sikkim.
Cooch Behar in Northern Bengal bordering Sikkim got very heavy rains of 16 cms on Sunday 21st in 9 hrs till 5.30 pm IST.
A Line of Wind Discontinuity will form in the Southern Peninsula interior region by 23rd. A pulse from the Bay will form a Low in Interior Karnatak around the 23rd.
Rains increase in Interior Karnataka and Maharahtra.
The WD mentioned in Friday's post is on schedule to form around the 25th in Northern Pakistan.
Mumbai: On and after Wednesday, the rain quantum will increase with thunder showers developing in the Outer Townships.