Equinox

Today is the first full day of autumn; the equinox was last night. Below is a video clip showing what the Earth looks like from space on the equinox (from Russian meteorological satellite Elektro-L). Note that the terminator line (between dark and light) is vertical, aligning with Earth’s axis of rotation.

Equinox

March 20 Thursday is the March Equinox–the beginning of spring in the Northern Hemisphere and the beginning of autumn in the Southern Hemisphere. It is one of the two days in the year that the Sun is directly over the equator. It is also one of the two days in the year the the Sun… Read More Equinox

Equinox

Yesterday (March 20) was the equinox (spring or vernal in the Northern Hemisphere), the day the sun is directly over the equator. If you were on the equator, at noon, the sun would be in the highest possible point in the sky, directly overhead. (Aside: Here’s a fun and somewhat technical post about where the… Read More Equinox