Solar Day - the time it takes between noon one day until noon the next. It is about 4 minutes longer than a sidereal day because the Earth is also revolving around the sun as well as rotating around on its axis. Look at Figure 1-10 to help you remember. Earth rotates West to East. Some stars seasonal, others always seen, some are never seen.
Earth revolves around the Sun.
Seasonal Changes - are due to the tilt of the Earth's axis. Zodiacal Constellations - constellations through which the sun appears to move during the year. Sun goes above and below equator. Sun highest and lowest at Solstices, crosses equator at equinoxes. Tropical Year - is the length of time it takes the Sun to return to the vernal equinox on the celestial sphere.