Define solar altitude, solar declination, and daylength, and describe the annual variability of each—Earth’s seasonality. Assess the 12-month Gregorian calendar, with its months of different lengths,...

Define solar altitude, solar declination, and daylength, and describe the annual variability of each—Earth’s seasonality.

Assess the 12-month Gregorian calendar, with its months of different lengths, and leap years, and its relation to the annual seasonal rhythms—the march of the seasons. What do you find?