Eclipse Kotkapoora Fdk

Project : Eclipse (Solar and Lunar) Class: 7th Created by: Baltina ( 7th B) Anu (7th B) Amandeep Kaur ( 7th A) Anita Rani (7th A) Guided by : Satinder Pal Singh (Computer Faculty) Jaswinder Singh (Computer Faculty)

What is Eclipse An eclipse is simply the shadow cast by one body upon another, when it passes in front of a source of light. An eclipse is an astronomical event that occurs when one celestial object moves into the shadow of another. The term is most often used to describe either a solar eclipse, when the Moon's shadow crosses Earth's surface, or a lunar eclipse, when the Moon moves into the shadow of Earth.

Umbra The umbra ("shadow") is the darkest part of a shadow. From within the umbra, the source of light is completely blocked by the object causing the shadow. This contrasts with the penumbra, where the light source is only partially blocked and there is only a partial shadow. The umbra is also the comparatively dark central region of a sunspot. Umbra is also a recurring figure in the Bionicle series.

Pemumbra The penumbra (for almost-shadow) is the portion of a shadow that results from the source of illumination being only partially blocked. Penumbras occur only

when the source of light is not a point source. As the sun is a visible disc, solar shadows have penumbras. The penumbra part of a shadow is contrasted with the umbra part of the shadow in which the light source is completely blocked.

Types of Eclipses  Solar Eclipse  Lunar Eclipse

Solar Eclipse A Solar eclipse occurs when the Moon passes between the Earth and Sun; this happens at the New Moon, and the effect is that observers on the side of the Earth facing the Sun (i.e. the side which is in daytime) have their view of it cut off, either partly or completely. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partially obscuring Earth's view of the Sun. This configuration can only occur during a new moon, when the Sun and Moon are in conjunction as seen from the Earth. In ancient times, and in some cultures today, solar eclipses are attributed to mythical properties. Total solar eclipses can be frightening events for people unaware of their astronomical nature, as the Sun suddenly disappears in the middle of the day and the

sky darkens in a matter of minutes. However, the spiritual attribution of solar eclipses is now largely disregarded

Solar Eclipse

Lunar Eclipse Lunar eclipse occurs whenever the Moon passes through some portion of the Earth's shadow. This can occur only when the Moon is full, and when the Sun, Earth and Moon are exactly on a line, or very closely so. A lunar eclipse occurs whenever some portion of the Earth's shadow falls upon the Moon. In order for this to occur, two general conditions need to be met. First, the Moon must be full; that is, from the perspective of the Sun, the Moon must be directly behind the Earth. However, since the orbital plane of the Moon is inclined by about 5° with respect to the orbital

plane of the Earth (the ecliptic), most full moon's will occur when the Moon is either north or south of Earth's shadow. Thus, a second condition for an eclipse to occur is that the Moon must be near one of the two intersection points it makes with the ecliptic, which are referred to as the Moon's ascending and descending nodes.The shadow of the Earth can be divided into two distinctive parts: the umbra and penumbra. Within the umbra, there is no direct solar radiation. However, as a result of the Sun's large angular size, solar illumination is only partially blocked in the outer portion of the Earth's shadow, which is given the name penumbra.

Bibliography Encarta Encyclopedia 2006 Computer Science Book (7th Class)