By J. L. E. Dreyer
A masterpiece of old perception and clinical accuracy, this can be the definitive paintings on Greek astronomy and the Copernican Revolution. starting with the traditional Egyptians, it levels from the Pythagoreans and Plato to medieval eu and Islamic cosmologies, concluding with detailed surveys of the works of Copernicus, Brahe, and Kepler.
Formerly titled: heritage of the Planetary platforms from Thales to Kepler
Read or Download A History of Astronomy from Thales to Kepler (2nd Edition) (Dover Books on Astronomy) PDF
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Extra info for A History of Astronomy from Thales to Kepler (2nd Edition) (Dover Books on Astronomy)
It has a large primary objective convex lens (consisting of two or more elements) at one end whereby the light from a celestial body enters and is brought to a focus. This light forms an image at the focal plane that can be magniﬁed and inspected by an eyepiece. The main advantage of this telescope is that it is essentially maintenance-free. So long as the telescope is aligned carefully during manufacture and the lens cell is robust the refractor should remain in good alignment. Refractors also tend to have a large focal length (focal length is the distance from the primary lens to the point where the light is brought into focus, as is shown in Fig.
It is wise to do this preliminary research, as you can ﬁnd out useful information about eye relief, or what the eyepiece is best suited for. Barlow Lenses A Barlow lens is an extra lens that boosts the magniﬁcation. It is ﬁtted between the drawtube and an eyepiece. A common Barlow lens may be a ×2 (though ×3 are becoming increasingly common), and it effectively doubles the magniﬁcation of an eyepiece. Barlow lenses are very useful and well worth investing in; if you have three eyepieces and a ×2, then effectively you have six possible choices of magniﬁcation.
Starting at position 1, Mercury is behind the Sun and is said to be in superior conjunction. The planet is not visible from Earth during this time. The planet then moves in it’s orbit towards position 2 to start an eastern elongation. During this time, the planet appears to viewers on Earth as a waning gibbous and is visible in the evening sky. As can be seen in the diagram, the planet is coming closer to the Earth, and so it’s apparent size increases. The planet continues in it’s orbit until it reaches Position 3, the point of ‘dichotomy’ At this point it appears to be half illuminated- just like a half moon.
A History of Astronomy from Thales to Kepler (2nd Edition) (Dover Books on Astronomy) by J. L. E. Dreyer