Early navigators used the sphere to plot a navigational triangle ... charts that gave the star’s angular distance from the celestial equator, or declination, and determining the angle at ...

At precisely 9:01 UTC (5:01 a.m. EDT) on March 20, our star will cross the celestial equator during the vernal (spring) equinox. Earth's axis will be side-on to the sun, meaning there will be more ...

The Northern Hemisphere will mark the arrival of spring on March 20 with the vernal equinox, an astronomical event that occurs when the sun crosses the celestial equator, bringing nearly equal ...