Ah, spring! It couldn’t come sooner for me. Like many Newarker’s and New Jerseyans, this winter was harsh, cold and snowy. This season brings increasing daylight, warming temperatures, and the rebirth of flora and fauna.
It is time to plant those seed, clean the garden, and let the planting season begin. The word equinox is derived from the Latin words meaning “equal night.” Days and nights are approximately equal everywhere and the Sun rises and sets due east and west.
An equinox occurs twice a year (around 20 March and 22 September), when the plane of Earth’s equator passes the center of the Sun. At this time the tilt of the Earth’s axis is inclined neither away from nor towards the Sun. The term equinox can also be used in a broader sense, meaning the date when such a passage happens. The name “equinox” is derived from the Latin aequus (equal) and nox (night), because around the equinox, night and day are about equal length.
At the equinoxes, the tilt of Earth relative to the Sun is zero, which means that Earth’s axis neither points toward nor away from the Sun. (However, the tilt of Earth relative to its plane of orbit, called the ecliptic plane, is always about 23.5 degrees.)
Vernal Equinox Questions and Answers
Question: Why doesn’t the vernal equinox (equal night) on March 20 have the same number of hours for day and night?
Answer: Our former astronomer, George Greenstein, had this to say: “There are two reasons. First, light rays from the Sun are bent by the Earth’s atmosphere. (This is why the Sun appears squashed when it sets.) They are bent in such a way that we are actually able to see the Sun before it rises and after it sets. The second reason is that daytime begins the moment any part of the Sun is over the horizon, and it is not over until the last part of the Sun has set. If the Sun were to shrink to a starlike point and we lived in a world without air, the spring and fall equinoxes would truly have ‘equal nights.’”
Question: According to folklore, you can stand a raw egg on its end on the equinox. Is this true?
Answer: One spring, a few minutes before the vernal equinox, several Almanac editors tried this trick. For a full workday, 17 out of 24 eggs stood standing. Three days later, we tried this trick again and found similar results. Perhaps 3 days after the equinox was still too near. Try this yourself and let us know what happens!
Signs of Spring
Spring is also the time when worms begin to emerge from the earth, ladybugs land on screen doors, green buds appear, birds chirp, and flowers begin to bloom. The vernal, or spring, equinox signals the beginning of nature’s renewal in the Northern Hemisphere.
You can track when the seasons change by recording animal behaviors and the way that the plants grow. Listen to the new sounds and observe what you hear and see.
How do you know that spring is coming? Share your comment below!