Next Monday (March 20), the length of day and night will be approximately equal all over the world because the Vernal Equinox phenomenon will be happening at 1:29 pm Doha local time, say experts.
This phenomenon is important for all the people in the world, where the vernal equinox and all four astronomical seasons are an indicator for climatic changes. On this day, people can observe the exact positions of sunrise and sunset over all countries on eastern and western horizons, respectively, said a statement issued yesterday by Dr Beshir Marzouk and Dr Mohammed Al Ansari of the Qatar Calendar House.
“On this day, the day will be 12 hours and 7 minutes long while night length will be 11 hours and 53 minutes. Sunrise over Doha will be at 5:38 am, and sunset at 5:45 pm Doha local time,” it said.
There are two reasons for vernal equinox happening (all four seasons too) - the first is the earth's rotation on its orbit around the sun every 365.25 days approximately (length of year), and the second is tilting of earth's axis over its orbit plane by 23.5 degrees.
On the vernal equinox day, the sun will be vertical on the earth's equator, while after vernal equinox day, the apparent motion of the sun will be going to north direction of northern hemisphere, where the day length become longer than night length until the sun will be vertical over northern tropic (cancer tropic) on June 21 (it is longest day length).
The winter length this year was 89 days, while the spring length will be 93 days.
