What is the cause of Uttarayan (summer solstice) and Dakshinayan (winter solstice) of the Sun on the Earth?
Answers
summer solstice:
The summer solstice (or estival solstice), also known as midsummer, occurs when one of the Earth's poles has its maximum tilt toward the Sun. It happens twice yearly, once in each hemisphere (Northern and Southern). For that hemisphere, the summer solstice is when the Sun reaches its highest position in the sky and is the day with the longest period of daylight. Within the Arctic circle (for the northern hemisphere) or Antarctic circle (for the southern hemisphere), there is continuous daylight around the summer solstice. On the summer solstice, Earth's maximum axial tilt toward the Sun is 23.44°. Likewise, the Sun's declination from the celestial equator is 23.44°
winter solstice:
The winter solstice, hiemal solstice or hibernal solstice, also known as midwinter, occurs when one of the Earth's poles has its maximum tilt away from the Sun. It happens twice yearly, once in each hemisphere (Northern and Southern). For that hemisphere, the winter solstice is the day with the shortest period of daylight and longest night of the year, when the Sun is at its lowest daily maximum elevation in the sky.[1] At the pole, there is continuous darkness or twilight around the winter solstice. Its opposite is the summer solstice.
Answer: causes:
revolution of the earth around the sun
tilt of the earth axis
parallelism of earth axis
Explanation:
on june 21 , the sun's rays falls vertically above the tropic of cancer. so the longest day in the northern hemisphere and shortest day n southern hemisphere . This is called summer solstice
on december 22 , the sun's rays falls vertically above the tropic of capricon. so the longest night in the southern hemisphere and shortest night in the southern hemisphere . This is called winter solstice .