Eratosthenes measured the circumference of the Earth to within 4% of the correct value noting how much more of the celestial sphere came into view when walking south using the detailed reports of far-sailing mariners sighting the stars from within the deepest well in Egypt on the day of the solstice looking at stick shadows on the equinox

Q: If the celestial sphere were to be considered a hypothesis, would it be correct?

A: Celestial sphere is a sphere of extremely large radius concentric with earth. It gives the…

Q: Tycho's observations were accurate to about 1 arc minute (1'). To what distance does this correspond…

A: The size of astronomical objects is given in terms of their angular size as seen by an observer…

Q: The angle between two lines drawn from a point on Earth to two opposite sides of the Moon make an…

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Q: 7. Suppose you are on a strange planet and observe, at night, that the stars do not rise and set,…

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Q: Which unit of measurement is larger?

A: 1 rad = 57.3 degree. So for 1 rad we required 57.3 degree.  So 1 degree = (1/57.3) < 1 rad

Q: The shadow cast by a vertical pillar in Alexandria at noon during the summer solstice is found to be…

A: Answer:Yes There is a geometric connection between.

Q: A planet's speed in orbit is given by     V = (30 km/s)[(2/r)-(1/a)]0.5   where V is the planet's…

A: The speed of the planet in orbit is V=(30 km/s)[(2r-1a)]0.5 To find the Earth's velocity in its…

Q: Observéd Phases UI ven heliocentric módel geocentric model sun sun Earth Earth epicycle orbit not to…

A: The position of venus is between sun and earth and thus it must predict the phases of venus.

Q: If you start at the equator and travel to 10 degrees north approx. how many kilometers (or miles)…

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Q: Match each Greek with the discovery attributed to them. (If the first corresponds to B, and the next…

A: 1) (C) The credit for the discovery of the Relative sizes of the earth, moon and the sun goes to…

Q: The distance between Jupiter and the sun is usually measured in astronomical units.one astronomical…

A: An astronomical unit can be defined as the mean distance between Sun - Earth or it is  half of the…

Q: How does the diameter of the Sun compare with the diameter of the Moon’s orbit around the Earth?

A: The diameter of the Moon’s orbit around the Earth is, 769000km.The diameter of the sun’s orbit is…

Q: Suppose the Sun were somehow replaced by a star with five times as much mass. How long would the…

A: Earth year is the amount of time that the earth takes to complete 1 revolution in its orbit about…

Q: As we discussed, the radius of the Earth is approximately 6370 km. The Sun, on the other hand, is…

A: Given:  Radius of Earth = 6370 km Radius of Sun  = 700,000 km Distance between earth and sun =…

Q: The radius of the Earth's orbit is 1.50  1011 m and that of Mars is 2.28  1011 m. The star that this…

A: The radius of mars is, R=2.28×1011 m The mass of the sun is, M=1.989×1030 Kg The gravitational…

Q: If a planet is 100 astronomical units from the sun, how long would it take to orbit the earth?

A: We have the distance of the planet from the sun D=100 AU   According to the Kepler's 3rd law of…

Q: Given that a geocentric universe is (mathematically) only a matter of the choice of a reference…

A: The first principle of the Ptolemaic model is eccentric motion. A body traveling at uniform speed on…

Q: discuss some of the cultural and philosophical implications related to the geocentric model

A: The geocentric model, which places the Earth at the center of the universe, has had significant…

Q: Select all of the following that describe an AU. OThe average distance between Earth and our Sun…

A: Astronomical unit is a unit of distance commonly known as AU.

Q: due southeast, what is the azimuth of that planet in degrees at that instant from their location?

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Q: If you are at latitude 25 degrees north of Earth's equator, what is the angular distance (in…

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Q: UUse the table to answer questions T13 A student collects the following data about the Sun, stars,…

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Q: a method for determining the sizes of the orbits of pl from the sun than Earth. His method involved…

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Q: Proof of why the Copernican model is more compatible with explaining the solar system than the…

A: The Copernican model, proposed by Nicolaus Copernicus in the 16th century, and the Ptolemaic model,…

Q: Can earth be regarded as a point object when describing its yearly journey around the sun? a) Yes b)…

A: Yes

Q: Suppose you discovered a new celestial body going around the sun. If it requires 512 years to…

A: Given, Time period of celestial body (T)= 512 year

Q: suppose eratosthenes results for earth's circumference were quite accurate if the diameter of the…

A: To find the length of Eratosthenes's stadium, we divide the circumference of the Earth by the number…

Q: The first proof that the Earth orbits the Sun was provided by   A)  Tycho's observations…

A: The first proof that the Earth orbits the Sun was provided by Galileo's observation of the phases of…

Q: Which unit of length would most likely be used to measure the distance from Earth to stars other…

A: Answer            d) Astronomical unit

Q: his

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Q: Ptolemy model of the solar system was by far the simplest and most elegant model.  true or false

A: False. 1)Ptolemy's model: Ptolemy thought that all celestial objects including planets,sun,moon and…

Q: Suppose Eratosthenes’ results for Earth’s circumference were quite accurate. If the diameter of…

A: Eratosthenes was the first Greek polymath to calculate the circumference of Earth. He had observed…

Q: Ancient astronomers believed that the sun, moon, stars, and planets were tied to a revolving what to…

A: It is required to explain the annual and daily movement of the sky.

Q: Use the given information to answer the question. The weight of an object above the surface of the…

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Q: Assume that the length of major axis of Earth's orbit is 186,000,000 miles and that the eccentricity…

A: The aphelion distance is the furthest distance of the Earth in an elliptical orbit around the sun.…

Q: Name two weaknesses of the Ptolemy model of the universe. The earth being the center of the universe…

A: Ptolemy was supporter of Geocentric model of universe, which says that the Earth is at the centre…

Q: For daily and yearly motions, ancient astronomers thought that the sun, moon, stars, and planets…

A: Give: Ancient astronomers thought that the sun, moon, and stars were locked to concentric circles…

Q: Tonight you see a waning crescent in the night sky. A few (n) days later, the night is once again…

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Q: Match each discovery, model, or Law with the person we credit with discovering them (Select T-Tycho…

A: (A) P – (Ptolemy). Around 140 A.D. Ptolemy devised the earliest geocentric model.(B) K – (Kepler)…

Q: The radius of the earth is 6400 Km and the height of a person is 1.7m, how high can you stand to see…

A: Given: Radius of earth, RE=6400 km Height of person, 1.7m To Find: Height to see the Horizon

Q: How does the position of the moon and sun affect the tides? Which is more important? What is the…

A: Moon plays an essential role in influencing the tides of the ocean. Moon is much closer than the…

Q: Given exactly 360° in a circle and 365.24 days in a year, how many degrees per day does one's view…

A: degrees in one complete circle = 360 degrees number of days in a year = 365.24 days

Q: could measure Earth's diameter using nothing but a shadow-casting stick, a protractor, and a car's…

A: We know that the cities must be on the same latitude line and at least 120 kilometers apart. For…

Q: How, and by roughly how much, would the length of the solar day change if Earth’s rotation were…

A: Introduction: There are two types of motion of earth. It revolves around the sun and at the same…