PLEASE ANSWER ALL 3 QUESTIONS CORRECTLY 1.Moon in the Sky? In the figure below t

Question

PLEASE ANSWER ALL 3 QUESTIONS CORRECTLY

1.Moon in the Sky? In the figure below the Moon phases are shown above the southern horizon during "The Sky at Sunset" and "The Sky at Sunrise." Using the diameter of the Moon shown, estimate the number of moon diameters the Moon drawn in panel 7 or 21 is above the southern horizon. Knowing the angular diameter of the Moon, which is 3470 km, how many degrees above the southern horizon is the Moon drawn in panel 7 or 21?

_________degrees.

2.Solar Eclipse I. During a solar eclipse, the Moon casts a shadow on Earth. If you are on Earth and in the umbra during the eclipse, what is the approximate angular diameter of the Moon in the sky in units of degrees?

_____degree.

3. Phobos's Angular Diameter. Phobos, one of the moons of Mars, is 20 km in diameter and orbits around 6000 km above the surface of the planet. What is the angular diameter of Phobos as seen from Mars?

Explanation / Answer

2. During solar eclipse the moon passes between the earth and sun and completely or partially block the sun ray's reaching the earth's surface. The solar eclipse can happen only during new moon. If we are on earth and the umbra of the moon during this alignment we can see the total solar eclipse. During the total solar eclipse the moon's apparent size completely blocks the sun and only solar corona is visible.

Angular size of a celestial body is the diameter a body appears n the sky expressed in degrees. It is related by true size or diameter and the distance of the body from the earth

Angular or apparent size=180/pi* true size/ distance

True size of moon=3480km( approx diameter)

Average distance from earth=384,000 km

Now angular size=180/3.14*3480/384000

=57.3*0.009

=0.5 degree

angular diameter of moon is 0.5 degree from earth

3. Phobos diameter=20km( given)

Phobos distance from mars=9380km

Angular diameter of phobos=180/3.14*20/9380

=57.3*0.0021

=0.12 degree

Angular diameter of phobos is 0.12 degree from Mars

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