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Eclipses
Utility of the presentation
This presentation is to show how eclipses occur. As, it is not possible to show the occurrences of eclipses in the classroom.
So it is a unique opportunity to see and comprehend ( with the help of different slides presentation) eclipses.
Objectives
Concepts of Eclipses Causes of Eclipses Types of Eclipses. Importance of Eclipses. Effects Occurences of Eclipses
Concept of Eclipses The earth and the moon are both opaque objects.
They revolve around the sun(a light source). When the sunlight is obstructed by these bodies, shadows are formed. These are called ECLIPSES.
Causes of Eclipses
1.Solar Eclipse.In the course of its revolution around the earth, the moon comes between the sun and the earth. The moon blocks a part of the light from the sun. This happens on a new moon day. The shadow of the moon falls on the earth.
Solar Eclipse
SunSun
EarthEarthMoonMoon
Activity:1. Place a football on a table. It represents the earth.
2. Flash a torchlight (which represents the sun), at the football
3. Place a tennis ball (which represents the moon) between the football and the torchlight in line with them.
4. The shadow of the tennis ball( moon) falls on the football (earth). This is the SOLAR ECLIPSE
FootballFootballTennisballTennisballTorchlightTorchlight
Causes of Eclipses
2. Lunar Eclipse. During a full moon day, the earth comes between
the sun and the moon. On such a day when all the three bodies are exactly aligned, the earth casts its shadow on the moon. This causes a LUNAR ECLIPSE.
Lunar Eclipse
SunSunEarthEarth
MoonMoon
Activity
1. Place a tennis ball on a table. It represents the moon.2. Flash a torchlight (which represents the sun) at the tennis
ball.3. Place a football (which represents the earth) between the
tennis ball and torchlight in line with them. The shadow of the football (earth) falls on the
tennis ball (moon) causing a Lunar Eclipse to occur
FootballFootball
TennisballTennisball
TorchlightTorchlight
Eclipses
Solar Eclipse
Total Solar Eclipse
Partial Solar Eclipse
Lunar Eclipse
Total Lunar Eclipse
Partial Lunar Eclipse
ImportanceImportance
Scientific: During eclipses scientists and astronomers study the position of the Sun, earth, moon and star.
Mythological: Indian concept eclipses are many mythological aspect.
EffectsEffects During a solar eclipse one must never look at the
sun directly. The rays of the sun may damage the eyes.
Birds and animals mistake it for nightfall. Many astronomical problems can be studied only
during total eclipse of the sun. Today scientific solar eclipse observations are
extremely valuable.
Occurences of eclipsesRecently happened solar eclipses1.oct.24,1995---India.2.June21,2001---Africa3.June,2000---Australia
Lunar eclipses1.Jan,9-10,20012.Mar29,2006
Forecast July22,2009.