When does an eclipse season occur? only if both the sun and the moon appear at n

Question

When does an eclipse season occur?

only if both the sun and the moon appear at nodes of the moon's orbit

any time the sun appears at a node of the moon's orbit

only once every 18 years

any time the moon appears at a node of its orbit

Based on how the positions of the moon, sun, and Earth create the right conditions for total and partial solar eclipses to occur, select all of the correct statements from the following list.

Lunar eclipses happen frequently—usually about once every month.

Because the moon's angular diameter in the sky as viewed from Earth changes, the moon passing between Earth and the sun may not entirely block the sun from view during a solar eclipse.

Only observers directly in the path of the moon's shadow will see an eclipse.

Solar eclipses occur most commonly during a full moon.

The sun's corona becomes visible during a solar eclipse.

No sunlight reaches Earth during a total solar eclipse.

During a solar eclipse, the moon casts a shadow on Earth.

Sidereal Time. The time is noon, and you see the Moon high in the sky. In that same month, you see the Moon at midnight high in the sky. What are these two moon phases?

____ and _____.

How much time has elapsed between the two phases? Express your answer in fractions of a day.

days.

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?

___________ arc seconds.

Explanation / Answer

Moon's sidereal orbital period or sidereal months is 27.3 days in which time it takes 360 revolution. let us say one full moon to full moon.

so if we want to see the moon exactly in the mid night at the same height in the sky the period should be half of sideareal period.

which 13.65 days.

these two moon phases must be opposite full to null

Phobos angular diameter

If the object is located 6000 km from the surface of the planet and moves a particular velocity let us say 2.1 km, it will appear to cover an angle of 57.3x(2.1/6000)=0.02 degrees. There are 60 arcminutes in 1 degree so this angle is 1.2 arcminutes. Since the distance is travelled in 1 second, the angular speed thus is 1.2 arminutes/second.

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