Sidereal

consider: con = with, sider = star-group, sky

1350-1400; Middle English consideren (< Anglo-French) < Latin consīderāre to examine, equivalent to con- con- + sīder- (stem of sīdus) star-group, sky (see sidereal ) + -āre infinitive suffix

sidereal:

1625-35; Latin sīdere (usof, belonging to the starssīder-, stem of sīdus star, constellation + -eus adj.suffix) + -al1

http://dictionary.reference.com/browse/consider?s=t

http://dictionary.reference.com/browse/sidereal

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