Q : Is it true that the only time the sun rises exactly due east and sets exactly due west is at the March and September equinoxes?
12.
In North America, autumn is usually considered to start with the September equinox ( 21 to 24 September ) and end with the winter solstice ( 21 or 22 December ).
13.
The sun rises on the September equinox, reaches its maximum angle above the horizon on the summer solstice in the Southern Hemisphere, around December 20, and sets on the March equinox.
14.
:: Right, the rate at which the day grows shorter ( and sunsets occur earlier ) is greatest around the March and September equinoxes ( that is, at this time of year ).
15.
From the March equinox it currently takes 92.75 days until the June solstice, then 93.65 days until the September equinox, 89.85 days until the December solstice and finally 88.99 days until the March equinox.
16.
In addition there are two other Bihus : " Kongali Bihu " in October ( associated with the September equinox ) and " Bhogali Bihu " in January ( associated with the January solstice ).
17.
Today's date ( June 1 ) in such a system would simply be " 73 " ( or " 252 " if you prefer the September equinox ), give or take a day depending on timezone.
18.
This marks " noon " in the Pole's " year-long day "; from then until the September equinox, the sun will slowly approach nearer and nearer the horizon, offering less and less solar radiation to the Pole.
19.
Neglecting atmospheric refraction and the Sun's non-zero size, whenever and wherever sunset occurs, it is always in the northwest quadrant from the March equinox to the September equinox, and in the southwest quadrant from the September equinox to the March equinox.
20.
Neglecting atmospheric refraction and the Sun's non-zero size, whenever and wherever sunset occurs, it is always in the northwest quadrant from the March equinox to the September equinox, and in the southwest quadrant from the September equinox to the March equinox.
