Page 16 - Dream_2047_June_2020

ANNULAR S LAR ECLIPSE ACTIVITIES
ANNULAR SOLAR ECLIPSE ON
21 JUNE 2020
ACTIVITY-1
Finding the time of maximum Annularity
Background
Solar eclipse occurs when Sun, Moon and Earth come in a straight line. During the eclipse the shadow of Moon falls on Earth along a narrow band of land. The eclipse can be seen only from this narrow region. The percentage of the eclipse visible at a given location depends on the how much of the Sun’s disk gets obscured by Moon as seen from that location. The time at which the percentage of obscuration is maximum is known as the time of maximum eclipse.
Earth revolves around the Sun and Moon revolves around the Earth. Orbit of both Earth and Moon are not circular but elliptical and hence Earth comes near and goes farther away from Sun once in a year. Similarly, Moon also comes near and goes farther from Earth in approximately every 27.3 days. Because of this, we see the variation in their apparent size. In the process, on New Moon day if Moon is at closest approach and Sun, Moon, and Earth come in a straight line then we can expect a Total Solar Eclipse. Likewise, on New Moon day if Moon is at farthest point from Earth and Sun, Moon, and Earth come in a straight line, then we can expect an Annular Solar Eclipse.
Projection of Sun
With the help of a coordinator or team leader, make the arrangement of projecting the Sun as shown in picture below
After projecting the Sun, you will see the different phases of the Sun as shown in picture below:
Keep the track on your projected image of Sun and fill the observation table below.
Observation Table
Sr. No
Projected Image
Time
01
T1:
02
T2:
03
T3:
Calculation for time of maximum Annularity
From this table you can get the time of maximum annularity as below:
Time of Maximum Annularity =T1+T3 2
ACTIVITY-2
Finding percentage of Annular Solar Eclipse
Projection of Sun
With the help of a coordinator or team leader, make the arrangement of projecting the Sun as shown in the picture above.
At the instant when you get the projected image of Sun as above, you are supposed to draw the Sun’s and Moon’s image on the screen using a pencil or a marker.
Observation Table
From the projected image of the Sun and Moon you are supposed to measure the diameter of Sun’s and Moon’s image and fill the table below:
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