Page 10 - Curiosity_June_2020_FB

Object
Diameter of Moon’s projected image
Diameter of Sun’s projected image
OBSERVATION TABLE:
ACTIVITY-3
OBSERVATION TABLE:
Object Projected Image
Diameter
Distance between Mirror Projector and projected image
Sun’s image
S=
L=
Moon’s image
M=
10
Diameter
M=
S=
June 2020
To estimate the magnitude of Annular Solar Eclipse:
For calculating the magnitude of Annular Solar Eclipse, the following formula can be used: Magnitude of Annular Solar eclipse = Diameter of Moon’s projected image (M)
Diameter of Sun’s projected image (S) Note: The above activity can be performed only in the region of annularity.
Aim:
Finding angular size of the Sun and the Moon
Apparatus/Materials Required:
Ball mirror, ruler and pencil.
Procedure:
1. Project the image of the Sun with help of a ball mirror on a wall as shown in Figure 1.
2. Keep the distance between the ball mirror and wall approximately 20 to 30 m.
3. At the time of annularity, when you get the projected image of Sun mark both ends of the Sun’s and the Moon’s image with the help of a pencil as shown in Figure 4.
4. With the help of a ruler measure the diameter of Sun’s and Moon’s image as shown in Figure 4.
5. Measure the distance between the ball mirror
and the projected image of the Sun with the help of a ruler as shown in Figure 5.
Calculation for finding the Angular Size of Sun:
The angular size of Sun can be calculated as,
To calculate the Angular Size of Moon:
The angular size of Moon can be calculated as
Ө =360° M M 2π L
Note: The angular size of the Sun can be calculated from any location of India. However, for estimating the angular size of the Moon, the place of the observation should lie in the annularity belt.
Figure 5
Ө=360° s S 2π L