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Live from McDonald Observatory: Observing Venus: explore how it
Live from McDonald Observatory: Observing Venus: explore how it

... The  images  of  the  balloons  are  to  help  the   student  relate  their  knowledge  of  how   objects  appear  to  change  when  they  are   close,  or  far  away.       ...
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... the Sun for the first time after perturbation by the unknown object. If this is the case, then examination of the aphelion longitudes and periods of the comets in Table 1 might give a clue to the present position of the object. The longitude Lh of the hypothetical planet may be taken, to a first app ...
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Astronomical unit

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 7011149597870700000♠149597870700 meters (about 150 million kilometers, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
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