A partial lunar eclipse will occur at the Moon’s descending node of orbit on Sunday, April 5, 2099, with an umbral magnitude of 0.1680. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring about 1.4 days after perigee (on April 3, 2099, at 23:30 UTC), the Moon's apparent diameter will be larger.
Visibility The eclipse will be completely visible over North America, western South America, and the central and eastern Pacific Ocean, seen rising over northeast Asia and Australia and setting over eastern South America.
Eclipse details Shown below is a table displaying details about this particular lunar eclipse. It describes various parameters pertaining to this eclipse.
Eclipse season
This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.
Related eclipses
Eclipses in 2099 An annular solar eclipse on March 21. A partial lunar eclipse on April 5. A total solar eclipse on September 14. A penumbral lunar eclipse on September 29.
Metonic Preceded by: Lunar eclipse of June 17, 2095 Followed by: Lunar eclipse of January 23, 2103
Tzolkinex Preceded by: Lunar eclipse of February 23, 2092 Followed by: Lunar eclipse of May 17, 2106
Half-Saros Preceded by: Solar eclipse of March 31, 2090 Followed by: Solar eclipse of April 11, 2108
Tritos Preceded by: Lunar eclipse of May 5, 2088 Followed by: Lunar eclipse of March 6, 2110
Lunar Saros 143 Preceded by: Lunar eclipse of March 25, 2081 Followed by: Lunar eclipse of April 16, 2117
Inex Preceded by: Lunar eclipse of April 25, 2070 Followed by: Lunar eclipse of March 16, 2128
Triad Preceded by: Lunar eclipse of June 4, 2012 Followed by: Lunar eclipse of February 4, 2186
Lunar eclipses of 2096–2099 This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit. The penumbral lunar eclipses on June 6, 2096 and November 29, 2096 occur in the previous lunar year eclipse set.
Saros 143 This eclipse is a part of Saros series 143, repeating every 18 years, 11 days, and containing 72 events. The series started with a penumbral lunar eclipse on August 18, 1720. It contains partial eclipses from March 14, 2063 through June 21, 2225; total eclipses from July 2, 2243 through April 13, 2712; and a second set of partial eclipses from April 25, 2730 through July 9, 2856. The series ends at member 72 as a penumbral eclipse on October 5, 3000. The longest duration of totality will be produced by member 36 at 99 minutes, 9 seconds on September 6, 2351. All eclipses in this series occur at the Moon’s descending node of orbit.
Eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.
Tritos series This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.
Inex series This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.
Half-Saros cycle A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). This lunar eclipse is related to two partial solar eclipses of Solar Saros 150.
See also List of lunar eclipses and List of 21st-century lunar eclipses
Notes
External links 2099 Apr 05 chart Eclipse Predictions by Fred Espenak, NASA/GSFC