Lunar eclipses are always eclipses of a full Moon. That is, the Moon is always seen full just before and after Earth’s shadow passes over it. Why is this? Why can we never have a lunar eclipse when the Moon is in its crescent or half-moon phase?

Q: A man’s eyes 2.5 m above sea level can barely see the top of a lighthouse which is at a certain…

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Q: The smallest detail visible through Earth-based telescopes is about 1 arc second in diameter. What…

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Q: In a city located at 35 degrees latitude, a flat solar collector was placed inclined at an angle of…

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Q: If the azimuth angle of the solar vertex is equal to 36 degrees, then the ratio of the length of the…

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Q: The smallest detail visible through a Earth-based telescope is about 1.00 arcsecond in diameter. Use…

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Q: Maps of moon are upside down? Why.

A: Maps of the moon are upside down because:

Q: 10 On one evening in June, a student in Florida looked straight up in the sky and saw a…

A: When the Earth makes revolutions, it changes its position from one point to another.

Q: why does the moon seem to be producing light from the student’s view?

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Q: In addition to the formation of shadows and eclipses,  what other phenomena prove the rectilinear…

A: Formation of shadows is due to phenomena of rectilinear propagation of light . Shadows are created…

Q: If I notice that the moon sets at noon on a particular day, what can I conclude about the phase of…

A: The moon sets at noon means the angle between the sight for the moon and sight for the sun (horizon…

Q: Is it possible for a fire to cast a shadow?

A: Is it possible for a fire to cast a shadow?

Q: Compare the size of the Moon on the horizon with its size higher in the sky. One way to do this is…

A: The moon appears bigger when it is near the horizon however the distance between the Moon and Earth…

Q: man’s eyes 2.5 m above sea level can barely see the top of a lighthouse which is at a certain…

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Q: You have enrolled in a scuba diving class and while swimming under water in a nearby lake you look…

A: According to Snell's law,  n1sinθi=n2sinθrsinθr=n1n2sinθiθr=sin-1n1n2sinθi

Q: Arcseconds are the smallest units for measuring angular distance and also provide the most precise…

A: Given data:  Angular distance (θ) = 3' 40" 1' = 60''

Q: Why do we only see one side of the moon?

A: Tidal locking or synchronous rotation is a situation when the rotational period is same as the…

Q: What is an annular eclipse? Explain why annular eclipses occur.

A: The word annular means ring shaped. These eclipses are named for their darkest or maximum point even…

Q: Paul Doherty, also in the chapter-opening photos, displays images of an annular eclipse. Note that…

A: At the time of the annual eclipse the sun, moon, and the earth lines on the same line, also, the…

Q: Suppose you are standing such that a 32-foot tree is directly between you and the sun. If you are…

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Q: 7. When a "full" moon rises, the size appears to be larger than when it is directly overhead.  Why?…

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Q: When we look at the Sun, we are seeing it as it was 8 minutes ago. So we can only see the Sun “in…

A: The image of the object is formed on the retina of the human eye if the light ray coming from an…

Q: A setting Sun is seen as distorted on Earth, but not by astronauts on the Moon. What causes this…

A: Given: setting Sun

Q: Eclipses of the moons of Jupiter are observed from two locations, A and B, that are about 6 months…

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Q: Name the phenomenon responsible for the observed twinkling of stars. Will this twinkling be observed…

A: The earth contain atmosphere, in which a lot of layers of gases exist. This layers have different…

Q: The planet Mercury is closer to the Sun than the Earth is, so it can sometimes come between Earth…

A: Consider the given data as below. The ratio between the radius of Mercury and the Sun, RMRS=0.006…

Q: Do Earth and the Moon always cast shadows? What do we call the occurrence where one passes within…

A: Moon and Earth will always cast shadows. The shadows can be seen during the occurrence of eclipses.

Q: The Sun is about 9 X 107 miles from Earth and has a diameter of 387,000. What is its apparent height…

A: Given data: The distance of Sun from the Earth is l=9×107 miles. The diameter of the Earth is…

Q: When the "full" moon rises, the color is yellowish while its color directly overhead is white.  Why?

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Q: Stars have a brighter light than Sun. Hence they are not visible in the morning but then why is the…

A: In the whole lunar month the moon is the single  instant that the exact time of the full moon  when…

Q: Suppose the Moon rotated on its axis just as quickly as Earth. Would we still always see the same…

A: Suppose the Moon rotated on its axis just as quickly as Earth. Would we still always see the same…

Q: Prove that the maximum duration of the eclipse is 72 minutes?|

A: Everything involving the motion of bodies in our Solar System, events like these come in cycles.…

Q: How can we calculate the duration of an eclipse

A: Sun to earth =1.5×108km Moon to earth=384400km Radius of earth, Rearth=6378 km Radius of sun,…

Q: The planetarium is making a scale model of the solar system. If they use a basketball to represent…

A: Let us assume the radius of the basketball is r cm. Now, we know that the average radius of the sun:…

Q: Why does the moon appear in the daytime?

A: The Moon sometimes appears in the daytime as it is the closest object to Earth.

Q: The vertical distance between eye level and the ground for a certain swimmer, who is standing…

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Q: Can stars be seen from moon's surface during daytime when sun is shining?

A: The sun and the stars are clearly visible from the surface of moon. This is because there is no…

Q: 1.6. Eratosthenes noticed that the shadow's length was 1/8 the pole's height. Suppose the pole's…

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Q: - If the angular height of a body is 22.45 degrees, then the azimuthal dimension is 77.15 76.55…

A: Angular height=22.45degrees Azimuthal dimension=?

Q: O Waning crescent Moon Waxing Crescent Moon Full Moon.

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Q: Determine, net foce on the moon during a solor eclipse the the moon are the asuming that the only 2…

A: Knowns: ME=5.98*1024 kg MM =7.36*1022 Kg MS =1.99*1030 Kg R=1.50*1011 m r=3.82*108 m

Q: Why don’t we have a solar eclipse and a Lunar eclipse every month?

A: Required : Why don’t we have a solar eclipse and a Lunar eclipse every month?

Q: The path of a total solar eclipse is modeled by f(t)=0.00387t^2−0.481t+26.103​, where​ f(t) is the…

A: Given that the expression of path of a total solar eclipse. Then We have to determine the value of…

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.