![]() The only light reflected from the lunar surface has been refracted by Earth’s atmosphere. A totally eclipsed Moon is sometimes called a blood moon for its reddish color, which is caused by Earth completely blocking direct sunlight from reaching the Moon. The type and length of a lunar eclipse depend on the Moon’s proximity to either node of its orbit. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned (in syzygy) with Earth between the other two, and only on the night of a full moon. The basic data used to write the eclipse chapter were borrowed from the DE405 digital integration, kindly provided by the Jet Propulsion Laboratory.A lunar eclipse occurs when the Moon moves into the Earth’s shadow. “t”: Total eclipse, whose totality phase is partially observable. “T”: Total eclipse, whose totality phase is fully observable. “r”: Annular eclipse, whose annular phase is partially observable. “R”: Annular eclipse, whose annular phase is fully observable. “p”: Partial eclipse of the Sun, partly visible. “P”: Partial eclipse of the Sun, visible. On solar eclipse visibility maps, the following codes are used: In region 6, the entire eclipse can be observed, in regions 5 to 7 the umbral phases are observable in regions 4 to 8 the totality is fully visible. The exits of the totality, the shadow and the penumbra are respectively observable in regions 4 to 9, 5 to 10, and 6 to 11. The codes used on the maps to indicate the moon eclipse visibility are: entry into the darkness is visible in regions 1 to 6, entry into the darkness in regions 2 to 7, the beginning of the totality in regions 3 to 8. The duration of the totality phase along the centrality line will reach a maximum of 1m 57s at a point located at 46° of longitude west and 77° of latitude south. IV – 4 December 2021 – Total solar eclipse, invisible in Belgium Magnitude of the eclipse: 0.978, the diameter of the lunar disk being taken as the unit. III – 19 November 2021 – Partial lunar eclipse, partially visible in Belgium The table below gives the phases for some representative Belgian sites. The altitude of the Sun is that of a reference point, which is located during the eclipse in the eclipsed part of the Sun, and which coincides with the times of contact with the point of contact of the Sun and Moon. At the beginning and at the end of the eclipse, they correspond to the position angles of the contact points. Both angles are measured at the centre of the solar disc in an anti-clockwise direction. the zenith, is the angle formed by the direction of the centre of the lunar disc with the direction of the pole, resp. The position angle relative to the pole, resp. Magnitude of the eclipse: 0.263, the diameter of the solar disk being taken as the unit. Phases in Uccle/Ukkel – Brussels (Observatory) ![]() The duration of the annular phase along the centrality line will reach a maximum of 3m 48s at a point located at 67° of longitude west and 81° of latitude north. Magnitude of the eclipse: 0.944, the diameter of the solar disk being taken as the unit. ![]() II – 10 June 2021 – Annular solar eclipse, visible in Belgium as a partial solar eclipse The explanation of the codes used can be found at the bottom of the page. The map below shows the region where the eclipse is observable. Magnitude of the eclipse: 1.015, the diameter of the solar disk being taken as the unit. The altitude and times of the Moon’s rise and fall are calculated for its center, without taking refraction into account. At the beginning and at the end of the penumbra and shadow phases, it is the position angle of the contact point. It is measured at the center of the lunar disc, from the North, in an anti-clockwise direction. The position angle is defined from the imaginary line that connects the center of the lunar disc to the center of the Earth’s shadow. The longitude and the latitude refer to the point on Earth where the Moon is at that time at its zenith. I – – Total lunar eclipse, not visible in Belgium In 2021, there will be four eclipses: two solar eclipses and two lunar eclipses Date
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