how to illustrate the locus of the Mars observed from the earth?Note that the locus of planets are ellipse and their orbit lies on a different plane and the speed of the earth is faster than Mars
closed as off topic by Raskolnikov, Asaf Karagila, Did, Ｊ. Ｍ., t.b. Nov 3 '11 at 8:46
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Ignoring the possibility of trying to illustrate Mars crossing the sky in a night, the obvious thing to do is illustrate it as points and a curve against the fixed stars. Various examples are shown at Courtney Seligman's page, one of which is also on Wikipedia
Alternatively, you could do some like Kepler's chart (note the zodiac round the edge as the fixed stars) in this image from Wikipedia