preview

A Report On Astronomical Eclipses

Better Essays

Eclipse
From Wikipedia, the free encyclopedia
This article is about astronomical eclipses. For other uses, see Eclipse (disambiguation).
"Total eclipse" redirects here. For other uses, see Total Eclipse (disambiguation).

Totality during the 1999 solar eclipse. Solar prominences can be seen along the limb (in red) as well as extensive coronal filaments.
An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer. An eclipse is a type of syzygy.[1]

The term eclipse is most often used to describe either a solar eclipse, when the Moon 's shadow crosses the Earth 's surface, or a lunar eclipse, …show more content…

The latter object will block some amount of light being emitted by the former, creating a region of shadow around the axis of the line. Typically these objects are moving with respect to each other and their surroundings, so the resulting shadow will sweep through a region of space, only passing through any particular location in the region for a fixed interval of time. As viewed from such a location, this shadowing event is known as an eclipse.[5]

Typically the objects involved in an astronomical eclipse are roughly circular in size,[5] and so the region of an object 's shadow during an eclipse is divided into three parts:[6]

The umbra, within which the object completely covers the light source. For the Sun, this light source is the photosphere.
The antumbra, extending beyond the tip of the umbra, within which the object is completely in front of the light source but too small to completely cover it.
The penumbra, within which the object is only partially in front of the light source.
During a lunar eclipse only the umbra and penumbra are applicable. This is because Earth 's apparent diameter from the viewpoint of the Moon is nearly four times that of the Sun.

The first contact occurs when the Moon 's disc first starts to impinge on the Sun 's; second contact is when the Moon 's disc moves completely within the Sun 's; third contact when it starts to move out of the Sun 's; and fourth or last contact when it finally leaves the

Get Access