parallactic ellipse
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parallactic ellipse — Astron. the apparent ellipse, as seen against the background of more distant stars, described annually by a nearby star because of the earth s orbital motion around the sun. Cf. parallax (def. 2) … Useful english dictionary
parallax — parallactic /par euh lak tik/, adj. parallactically, adv. /par euh laks /, n. 1. the apparent displacement of an observed object due to a change in the position of the observer. 2. Astron. the apparent angular displacement of a celestial body due … Universalium
Aberration of light — Light from location 1 will appear to be coming from location 2 for a moving telescope due to the finite speed of light, a phenomenon known as the aberration of light. The aberration of light (also referred to as astronomical aberration or stellar … Wikipedia
