1. On 21st March and on 23rd September d days nd nights are equal because on these days d axis is neither inclined towards d Sun nor away from it. We give these days d name as SPRING EQUINOX and AUTUMN EQUINOX respectively. 2. Largest day in Northern Hemisphere- 22June. Shortest day in Northern Hemisphere-23December. Largest day because Earth is inclined towards d Sun. Shortest day because-Earth is away from Sun. 3. a) 22June. B) 21March. C) 23September. Hope I helped u.. Plz mark as the BRAINLIEST answer..