The constellations were created by the Greeks. Polaris has always been the star nearest the north celestial pole. Hipparchus devised the magnitude system in the late 1700s. The celestial equator always crosses the horizon at the east point and west point. An eclipse season is the period of time during which the a. moon crosses a node in its orbit.
Spring tides occur a. at new moon and first quarter moon.
The saros cycle a. was used in ancient times to predict eclipses. On average the moon's umbral shadow is a. to bright to produce a total solar eclipse. The first quarter moon rises a. at about noon. The photosphere of the sun is obscured. The moon is in Earth's umbra.