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| shorting long strings of numbers usually with 0's in them |
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| the fist visibility of an object in the per-dawn sky after months in which it has been up only in the daytime |
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| the apparent path of the sun across the sky |
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| the apperent drifting backward or westward movement of the planets |
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| earth centered universe 55 celestial spears four basic elements, earth air fire and water, fifth essance quintessence |
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| plantes moving in smaller circles on their bigger circle to account for retrograde motion |
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| the center of the epicycles |
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| he recognixed that the earth is round and found the circumferance of the earth. using syene and alexandria and gnomon |
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| an upright stick that is allowed to cast a shadow in sunlight |
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| plantes closest to the earth along the same line as the sun |
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| 180 away from the earth on the other side of the sun |
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| a book of the planetary positions |
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opserved a super nova analysis of tychos data
the planets orbit the sun in ellipses with the sun at one focus
the line joining the sun and a planet sweeps through equal areas in equal areas in equal times
the square of the period of revolution is proportional to the cube of the semimajor axis of the ellipse |
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| theline within the ellipse that passes through the two foci or the length of that line |
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| which is just half the length of the major axis |
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| is the part of the line lying within the ellipse that is drawn perpendicular to the major axis and passing through its midpoint or the length of that line |
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| the distance between the foci divided by the length of the major axis |
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| average distance from the sun to the earth |
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| first to use telescope for astronomical observation |
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| the reflection of sunliht off the earth and over tho the moon |
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universiality of gravity
every object tends to remain either at reat or in uniform motion n a fixed directin unless some outside force changes its state.
for every action there is an equal and opposite reaction |
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| the property of mass that resists change in its motion is called inertia |
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| one crest of a wave to the next or one trough to the next |
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| renging from radiation of wavelength shorter than 1A t radiation of wavelength many meters long |
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| the ability to distinguish finer details in an image or to ditinguish two ajacent objects |
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| a telescope that has a lens as its major element |
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| the images of objects at infinity fall at a distanced behind the lens |
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| an image of an area of the sky |
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| a mirror reflects the light that hits it so that the light bounces off at the same angle at which it approched |
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| the steadiness of the earhs atmosphere |
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| the number of times an objects angular size is enlarged |
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| radiation acts as though t were composed of particles rather that continous waves light as particles of engery |
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