Total Solar Eclipse - April 8, 2024Eclipse Outreach Kit
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Eclipse OverviewEclipse Overview
For the April 8, 2024 Eclipse ...
Total Solar Eclipse happens roughly every year and a half somewhere on earth. Why isn't there an eclipse every month? Partial solar eclipse occurs at least twice a year. A total solar eclipse can only occur at the new moon phase. To see a solar eclipse, you have to be on the sunny side of earth, but the same spot on earth will see a total solar eclipse only about once every 375 years! There are at least two solar and two lunar eclipses (total or partial) every year visible somewhere on earth. The reason why there is not a solar eclipse every month is because the moon's orbit forms a plane that is tilted about 5 degrees relative to the plane of the earth's orbit. This means that most of the time the moon is either above or below the plane of the earth's orbit. Eclipses occur only when all three, sun, moon, and earth, line up in a row. To see a lunar eclipse, you have to be on the nighttime side of the earth. A solar eclipse occurs on the daytime side of the earth. During a solar eclipse, the moon's shadow extends about 400,000 km (248,500 miles) past or behind the moon. The moon's diameter (length of the straight line through the middle, widest part, of the moon) is about 400 times smaller than the sun's diameter; however, the moon is also 400 times closer to the earth than the sun. This makes the apparent size of the moon appear the same as the sun. When the moon passes across the middle of the sun, it just covers up the sun's disk in the sky as viewed from earth. The sun is completely blocked during a total solar eclipse. This is a total solar eclipse to an observer on the earth who is just under that moon's shadow.
In 2017, the moon's shadow (umbra) was about 70 miles wide and crossed 14 states across the United States from the Pacific Ocean to the Atlantic Ocean. The maximum eclipse was about 2 1/2 minutes of totality. In 2024, the shadow of the moon will be about 100 miles wide
and will travel across the United States at about 2,000 miles
per hour.
Maximum
totality will last about 4 minutes and 20 seconds in Texas
and this duration also depends on where the observer is inside
the
path of
totality. The maximum possible length of totality is 7 minutes
32 seconds. The
2024 solar eclipse is the last total solar eclipse in Texas
for this century. The next total solar eclipse in the United
States
will be
in 2045.
The Astronomical League is a federation of astronomy clubs with member societies nationwide. The Astronomical League is the World's Largest Federation of Amateur Astronomers. The Southwest Region of the Astronomical League consists of 28 member societies of the Astronomical League in the states of Texas, New Mexico and western Oklahoma. |