Friday 3 April 2015

The 4 April 2015 Total Lunar Eclipse.

A total Lunar Eclipse will occur on a April 2015, starting at about 9.00 am GMT. It will be visible across much of the Pacific, as well as most of Alaska, the Russian Far East, eastern Japan and eastern Australia. Part of the eclipse will be visible from remaining areas of the Americas as well as the rest of Australia most of Asia, although in these areas the Moon will either rise part way through the eclipse, or set before it is complete.

Areas from which the 8 October 2014 Lunar Eclipse will be visible. In the white area the full extent of the eclipse will be visible, in the shaded areas it will either begin before the Moon rises or end after the Moon has set, while in the darkest area it will not be visible at all. HM Nautical Almanac Office.

The Moon produces no light of its own, but 'shines' with reflected light from the Sun. Thus at Full Moon the Moon is on the opposite side of the Earth to the Sun, and its illuminated side is turned towards us, but at New Moon the Moon is between the Earth and the Sun, so that its illuminated side is turned away from us.

Lunar eclipses occur when the Moon passes through the Earth's shadow. This can only happen at Full Moon (unlike Solar Eclipses, which happen only when the Moon passes between the Earth and the Sum, and therefore only occur at New Moon), but does not happen every Lunar Month as the Sun, Moon and Earth are not in a perfect, unwavering line, but rather both the Earth and the Moon wobble slightly as they orbit their parent bodies, rising above and sinking bellow the plane of the ecliptic (the plane upon which they would all be in line every month).

Because the Moon is passing through a shadow, rather than being blocked from our view, it does not completely disappear during an eclipse like the Sun, but rather goes through two distinct phases of dimming, the Penumbra, when it is still partially illuminated by the Sun, and the Umbra, when the Earth completely blocks direct sunlight from the Moon. This does not result in complete darkness, as the Moon is still partially lit by reflected Earthlight, but it does turn a deep, dark red colour.

Phases of the Lunar Eclipse that will be seen on 8 October 2014. The times are given in GMT, to the nearest 10th of a minute, thus 08.14.0 represents 8.14 am GMT. HM Nautical Almanac Office.

See also...

The March Equinox fell on 20 March this year. The Earth spins on its axis at an angle to the plain of the Solar System. This means that the poles of the Earth do not remain at 90° to the Sun, but rather the northern pole is tilted towards the Sun for six months of the year (the northern summer), and the southern pole for the...

A total eclipse of the Sun will be visible from the Faroe Islands and Svalbard on Friday 20 March 2015, with a partial eclipse visible from the rest of Europe, West Asia, northern Arabia, North and West Africa, Iceland, Greenland and (briefly) Nova Scotia, Newfoundland and Labrador and parts of eastern Quebec. 

The climate of Earth is driven largely by the planet’s seasons; the axis about which the planet rotates is tilted relative to the plane of its orbit, so that its hemispheres are tilted either towards or away from the Sun for half of each year (with the poles spending several months in complete darkness), leading to differential warming of the hemispheres. Similar climatic systems have...

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