RK Bali, Air Navigation
The Solar System: DGCA Air Navigation questions
Seasons, day length and twilight come from the Earth spinning on a tilted axis while orbiting the sun on a slightly elliptical path. The tilt moves the sun's overhead point between the tropics through the year.
These 20 questions are factual: perihelion and aphelion, the axis tilt, the latitudes where the sun can be overhead or rise and set daily, mean and apparent sun, and civil twilight. Exam sessions have produced 11 of them.
Seasons come from the tilt, not distance; the Earth is nearest the sun in early January. The equator lies about 23.5 degrees to the ecliptic and the axis about 66.5 degrees, an easy pair to swap. Civil twilight runs while the sun's centre is no more than 6 degrees below the horizon.
0 answered·5 free questions·0 right
Question 1 of 5
Sun will appear at same latitude:
Question 2 of 5
Seasons are due to the:
Question 3 of 5
At what approximate date is the earth furthest from the sun (aphelion)?
Question 4 of 5
At what approximate date is the earth closest to the sun (perihelion)?
Question 5 of 5
What is the highest latitude listed below at which the sun will reach an altitude of 90⁰ above the horizon at some time during the year?
15 more questions in this chapter
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