What are the difference between the equinoxes and the solstices?

What is the right ascension and declination of the Sun at noon on the summer solstice in the Northern Hemisphere?

From September 22 to March 21, in what direction must an observer in the Northern Hemisphere look to see sunrise? (15.5) (a) east (b) northeast (c) southeast (d) west

Explain three lines of evidence that indicate that the seasons in North America are not caused by the changing Earth-Sun distance as a result of Earth’s elliptical orbit around the Sun.

How is Moon associated with a month?

Consider a calendar based entirely on the day and the month (the Moon’s period from full phase to full phase). How many days are there in a month? Can you figure out a scheme analogous to leap year to make this calendar work?

Identify the phases of the Moon if on March 20 the Moon is located at the point on the ecliptic called: (a) the vernal equinox, (b) the autumnal equinox, (c) the summer solstice, (d) the winter solstice.

Show that the Gregorian calendar will be in error by 1 day in about 3300 years.

Why is it difficult to construct a practical calendar based on the Moon’s cycle of phases?

On the day of the vernal equinox, the day length for all places on Earth is actually slightly longer than 12 hours. Explain why.