The Spring Equinox

Join Laura Marseglia to learn about the Spring Equinox Talk in this live-streamed astronomy talk.

The 2021 Spring Equinox will happen on March 20. Laura will discuss why equinoxes occur, what changes occur on the Earth, and how different cultures celebrate.
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Register now through PEEC’s website for The Spring Equinox Talk!
You will receive an email with a link to join the broadcast. We will be using the online platform called Zoom. You don’t need to create an account, but you will need the free Zoom app.
The Zoom invitation will provide simple instructions for downloading the app and joining the livestream.
Admission: Pay-what-you-can.
Image Credit: Earth at the March 2019 Equinox, NOAA Satellites
Friday, March 19, 2021 at 7 PM MDT – 8 PM MDT
Price: Free · Duration: 1 hr
PublicAnyone on or off Facebook

In the Northern Hemisphere, the March equinox (aka spring equinox or vernal equinox) occurs when the Sun crosses the equator line, heading north in the sky. This event marks the start of spring in the northern half of the globe. After this date, the Northern Hemisphere begins to be tilted more toward the Sun, resulting in increasing daylight hours and warming temperatures. (In the Southern Hemisphere, it’s the opposite: the March equinox marks the start of autumn, as the Southern Hemisphere begins to be tilted away from the Sun.)


In 2021, the March equinox happens on Saturday, March 20, at 5:37 A.M. EDT. In the Northern Hemisphere, this date marks the start of the spring season.

In the Southern Hemisphere, the March equinox marks the start of autumn, while the September equinox marks the start of spring.


Year Spring Equinox (Northern Hemisphere)
2021 Saturday, March 20, at 5:37 A.M. EDT
2022 Sunday, March 20, at 11:33 A.M. EDT
2023 Monday, March 20, at 5:24 P.M. EDT
2024 Tuesday, March 19, at 11:06 P.M. EDT


The word equinox comes from the Latin words for “equal night”—aequus (equal) and nox (night).

On the equinox, the length of day and night is nearly equal in all parts of the world.