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Using a compass determine the direction of south. Using a clock find out the time when the sun is south. For every hour after mid-day you are 15 degrees west of the point where the sun is south at mid-day. The clock should be set to mid-day when the sun is at longitude zero to get absolute values rather than relative values.
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What is the longitude and and latitude of the tropic of cancer?
The two tropics are lines of latitude at 23°26′13.0″ North and South of the Equator and they intersect all lines of longitude.
What invention allowed sailors do plot their positions at sea by looking at the stars?
The SEXTANT. This instrument will give the latitude of a ship. However, because of solar movements a CLOCK(Time piece) is needed to determine the longitude(meridian). So the two inventions are ; - The Sextant, and the Clock .
What are the two things that are necessary for clouds to form?
air and water
How can you tell which planet has the most circular orbit?
You can look through a list of the planets' orbits to see which one has the smallest eccentricity, and the answer is Venus, 0.006787. But if you are an astronomer wanting to find it out by observing the planets in the sky, you need to have five accurate positions for each planet, spaced out across a good fraction of the orbit, and then you can calculate the 'elements' of the orbit. One of the elements is the eccentricity. The eccentricity and the semimajor axis determine the shape and size of the orbit. Then there is the longitude of perihelion, which sets the orientation of the major axis of the ellipse. Two more are the inclination of the plane of the orbit to the plane of the Earth's orbit, and then the longitude of the ascending node, which defines the line of intersection of the two planes. Finally the longitude at the Epoch and the date of the Epoch are required because they set the starting conditions for the model.
A person knows the sun time on the prime meridian and the local sun time What determination can be made?
By knowing the sun time on the prime meridian and the local sun time, one can determine their east-west position on the Earth's surface. The time difference between the two locations can be used to calculate the longitudinal difference, helping to pinpoint the exact location.
