Astronomical spring will officially end, and astronomical summer will begin, on the summer solstice on Tuesday, June 21 at 5:13 a.m. Thus, meteorological spring began on March 1 and will end on May 31. Meteorological seasons begin on the first day of the months that include the equinoxes and solstices. Astronomical seasons are based on the position of the Earth in relation to the sun, while meteorological seasons are based on the annual temperature cycle. While astronomical spring began on March 20, meteorological spring began on March 1. ![]() The equinoxes are the only two times a year that the sun rises exactly due east and sets due west for nearly every place on Earth. This tilt means the two hemispheres are exposed to different sun angles and variable lengths of daylight throughout the year. The seasons change at various times of the year due to the planet’s axial tilt of 23.5 degrees as it orbits the sun. Additionally, the days become a little longer at higher latitudes farther from the equator, because it takes the sun longer to rise and set. The "nearly" equal hours of day and night is due to refraction of sunlight, or a bending of the light's rays that causes the sun to appear above the horizon when the actual position of the sun is below the horizon. At the equator, the sun is directly overhead at noon on these two equinoxes. The word “equinox” is derived from two Latin words-aequus (equal) and nox (night). There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in a nearly equal amount of daylight and darkness at all latitudes.These events are referred to as equinoxes and occur in the spring (vernal) and fall (autumnal). The vernal equinox-the official start of astronomical spring -occurred on Sunday, Maat 11:33 a.m. Whittaker is thanked for the webapps.Spring has officially sprung here in the Northern Hemisphere-while in the Southern Hemisphere, autumn has begun! These images were made using NOAA data with geo2grid software, from UW-Madison, SSEC. (Click on the image to go to the webapp.) (Click on the image to go to the webapp.) Explore the changing seasons on Earth by relating the orbit, rotation and solar insolation with this webapp by T. Webapps about the Seasons Screen shot of the webapp where one can explore the effect of the angle of incidence on sun’s energy. Can you estimate the day of the summery equinox? H/T Tom Whittaker, SSEC, for the webapp, as well as those below. One example might be to compare a solstice to an equinox. For example, draw lines along the terminator for different times of the year. A user can play the animation, as well as annotate the images. ![]() The beginning date is the (northern hemisphere) fall equinox in 2022 and the end date is the spring equinox in 2023. (Click on the image to go to the webapp.)Īn interactive web page with half a years worth of GOES ABI Full Disk visible images at 11 UTC. (Click on the image to go to the webapp.) An annotated image, with text and a line. Interactive web page The interactive web page that allows one to annotate images, such as drawing lines. The 16 bands of ABI from GOES-West and GOES-East from UW/CIMSS. GOES-16 ABI true color images at 11 UTC each day from the 2022 Fall to the 2023 Spring Equinox. These posted GOES ABI Full Disk imagery are only showing a small number of the pixels, for a fuller resolution image at one time ( 20-March-2023). Or this NOAA post.ġ1 UTC loops from the (northern hemisphere) fall Equinox to the Spring Equinox. For details, see “ What is a Solstice?” by SciJinks. For example, how the terminator falls on the Earth until the Equinox. Equinox: Fall 2022 to Spring 2023 as seen by GOESīy animating daily NOAA GOES-16 ABI Full Disk true color imagery, how the Earth is illuminated over time can be seen.
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