1/23/2024 0 Comments Lunar eclipse time 2015![]() ![]() It ends on September 28, the day of the supermoon eclipse, when the distance to the Moon is 28 Earth diameters. It then shows apogee on September 14, when the Moon is almost 32 Earth diameters away. The animation begins at the end of August showing that perigee and Full Moon miss each other by about a day. ![]() There will be seven more supermoon eclipses in this series, the last in December of 2141. The 2015 supermoon eclipse is the first in Saros 137. Eclipses separated by this period tend to share certain properties and are grouped into families, or saros series. Only then does the Moon's orbit carry it close enough to the Earth-Sun line to actually pass through the shadow cast by the Earth.Ī supermoon eclipse requires the alignment of all three cycles, the synodic, anomalistic, and draconic months, and this happens every 18 years 11 days, a period known as a saros. Total lunar eclipses happen when a node crossing coincides with a Full Moon. The Moon's tilted orbit crosses the Earth-Sun plane at one of two points called nodes a draconic month is the time it takes the Moon to return to the same node. Total lunar eclipses involve a third cycle, the draconic month. The anomalistic month - the time between two perigees - is two days shorter than the cycle of phases, called the synodic month the perigees "lap" the phases after 14 months. If we define a supermoon as a Full Moon that coincides with the closest perigee in a given year, then supermoons occur every 14 months, with occasional skips. The Moon makes first contact with the umbra, the central part of the Earth's shadow, at 1:07 UT, and it doesn't completely emerge until 4:27 UT. This is only an hour before the time of peak full Moon at 2:51 UT, when the Moon's ecliptic longitude differs from the Sun's by exactly 180 degrees.Īll of this takes place during a total lunar eclipse. The closest perigee for 2015 occurs on September 28 at around 1:52 Universal Time, when the Moon will be 356,877 kilometers (221,753 miles) away. Some perigees are a little closer than others. Each month, the Moon passes through points in its orbit called perigee and apogee, the closest and farthest points from the Earth for that month. The Moon's orbit is very slightly elliptical and therefore somewhat off-center relative to the Earth. As it happens, this largest Full Moon occurs within the Earth's shadow, creating the added spectacle of a total lunar eclipse. On Septem(the night of the 27th in many places), the Moon will be full at the same time that it is closest to Earth for the year, a coincidence sometimes called a supermoon. ![]()
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