A total lunar eclipse, often referred to as a “blood moon,” is set to be visible across the United States and other regions of the Western Hemisphere on the evening of March 13, continuing into March 14, depending on geographical location.

In San Antonio, the eclipse will occur between midnight and 4 a.m., providing an excellent opportunity for local residents to witness this celestial phenomenon.

Understanding the ‘Blood Moon’

The term “blood moon” describes the appearance of the moon during a total lunar eclipse, which occurs when the Earth stands directly between the sun and the moon. This alignment causes the Earth’s shadow to cover the moon, filtering sunlight through its atmosphere and creating a reddish hue. Professor Angela Speck from the University of Texas at San Antonio explained this phenomenon, remarking that it resembles “every sunset and sunrise reflected at the moon.”

This upcoming full moon is designated as the “worm moon,” a name stemming from the observations of Native American tribes in the northeastern United States, who noted the appearance of earthworm casts as spring approached.

Visibility and Conditions

The total lunar eclipse can be enjoyed with the naked eye, although for a more enhanced experience, binoculars or telescopes are recommended. According to meteorologist Cory Van Pelt from the National Weather Service, San Antonio is expected to experience 25% cloud coverage during the early morning hours of March 14, with temperatures ranging from 60 to 70 degrees Fahrenheit and winds at 5-7 mph.

Duration and Stages of the Eclipse

Total lunar eclipses occur approximately twice a year; however, they are viewable from only one hemisphere at a time, as noted by Speck. The entire process of the lunar eclipse will last around six hours, which is significantly longer than solar eclipses that last a maximum of 7.5 minutes. The reason lies in the size of the Earth’s shadow, which is about four times larger than the moon.

Eclipse Timeline

• March 13
  • 10:57 p.m. — The penumbral eclipse begins; the dim shadow starts to envelop the moon.
• March 14
  • 12:09 a.m. — The partial eclipse commences, visibly darkening the moon.
  • 1:29 a.m. to 2:31 a.m. — Totality occurs, and the moon is fully shaded.
  • 3:47 a.m. — The end of the partial eclipse, with the shadow moving past the moon.
  • 5:00 a.m. — The penumbral eclipse concludes as the moon exits the Earth’s shadow.

Viewing Recommendations

For the best viewing experience, Speck advises moving away from city lights to find darker environments while observing the eclipse. Unlike solar eclipses, protective glasses are not required to view a lunar eclipse, making this event accessible for many astronomy enthusiasts and casual observers alike.

This eclipse represents the only opportunity for San Antonio residents to witness a lunar or solar eclipse in 2025.