Question

c, To the circle shown below draw lines of sight from position x to the edges of the circle. Measure the apparent angular size of the circle at position X and reco below. Repeat for position Y apparent angular size at X apparent angular size at Y d. What are two reasons that a celestial ob- ject may have a large apparent angular size? e. Because the sun and moon have the same apparent angular size, we are occasionally able to enjoy the spectacular beauty of a total eclipse of the sun. If the sun is very much larger then the moon, why is it that they present the same apparent angular size? f. If the moon is slowly moving away from the earth, what do you predict solar eclipses to be like in the distant future years?

Answer 1

Apparent Angular Size of a celestial body is the angle formed by the body on the eye of observer or on optical instrument.If body subtended large angle then it appears bigger while if it subtended small angle then it appears small.In case of moon and sun both subtended nearly same angle so they appears nearly of equal size.

Apparent Angular Size of a celestial body is the angle formed by the body on the eye of observer or on optical instrument. If body subtended large angle then it appears bigger while if it subtended small angle then it appears small. In case of moon and sun both subtended nearly same angle so they appears nearly of equal size. (c) Take A protector and measure the angle alpha and beta that will give the angular size of circle at x and y positions. (d) The two reasons are: - (i) celestial body is actually neat to us. (ii) size of celestial body is large. (e) sun's diameter is nearly 400 times larger than moon while distance is also nearly angle to the eyes of observe on earth or apparent angular size of both are same. (f) If the moon is moving away from us then in future apparent size of moon becomes less than today's size. So in when, solar eclipse will occur