Sidereal period
noun
1.
(astronomy) the period of revolution of a body about another with respect to one or more distant stars
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adjective, sicklier, sickliest. 1. not strong; unhealthy; ailing. 2. of, connected with, or arising from ill health: a sickly complexion. 3. marked by the prevalence of ill health, as a region: the epidemic left the town sickly. 4. causing sickness. 5. nauseating. 6. maudlin and insipid; mawkish: sickly sentimentality. 7. faint or feeble, as light […]