The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said the country will experience the autumnal equinox on September 23, Wednesday, when day and night have equal length. In its monthly astronomical diary, PAGASA said autumnal equinox will occur on September 23 (4:20 p.m.) when day and night will have equal length on earth.
Thereafter, Philippine nights will be longer as the sun moves below the celestial equator towards the southern hemisphere, the state weather bureau said.
In an interview, Mario Raymundo, chief of the PAGASA Astronomical Observation and Time Unit, said the autumnal equinox will happen on September 23, when day and night are nearly exactly the same length – 12 hours – all over the world.
Raymundo noted that it exposes the countries below the equator or in the southern hemisphere to more sun and those above it to less sun.
He said longer nights in the northern hemisphere will prevail until December. “After ng September 23 ay dahan-dahan ng hahaba ang gabi sa Pilipinas na nasa northern hemisphere. Ibig sabihin ay mas maaga ng lulubog ang araw,” Raymundo said. “Pagdating ng December, mga around 5:30 p.m. pa lang ay lulubog na ang araw.”
Raymundo said the astronomical event of autumnal equinox signifies the approach of winter in the northern hemisphere and summer in the southern hemisphere.