This was super special, probably happening very rarely in our lifetimes.
The Autumnal Equinox is when twice a year, the Sun is exactly above the Equator and the day and night are of equal length.
This occurred on Tuesday, 22nd September 2020.
What made it even more special was the Sun Halo, which occurred around noon time and we could see it in Singapore.
Here's some pictures I took from our balcony and some sent by friends.