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2021
The astronomical unit (AU) was first used in ancient Greece after Pythagoras had developed geometry. Although they could not measure the distance from the Earth to the Sun, the Greeks could use the relationships of the angles and sides of a right triangle to determine the distance of Venus or Mercury from the Sun as a function of the Earth–Sun distance,
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The astronomical unit (AU) was first used in ancient Greece after Pythagoras had developed geometry. Although they could not measure the distance from the Earth to the Sun, the Greeks could use the relationships of the angles and sides of a right triangle to determine the distance of Venus or Mercury from the Sun as a function of the Earth–Sun distance,
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Electromagnetic Distance Measurement
1978The direct method of distance measurement discussed in chapter 1 has the disadvantage that measurements over unsuitable terrain or on congested sites can be very difficult and, in some cases, impossible. This problem was overcome with the development of optical distance measurement techniques (see chapter 6) but, in general, such methods are only ...
J. Uren, W. F. Price
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Medium distance GPS measurements
1998In this chapter we discuss GPS geodesy at medium distances which in some ways is the most challenging. As indicated in Chapter 1, GPS can be considered a global geodetic positioning system providing nearly instantaneous position with 1–2 cm precision with respect to a consistent terrestrial reference frame. Nevertheless, as we shall see in this chapter,
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