See also:

• EQUATION (from Lat. aequatio, aequare, to equalize)

EQUATION OF THE CENTRE  , in See also:

• ASTRONOMY (from Gr. &arpov, a star, and v ,usiv, to classify or arrange)

astronomy, the angular distance, measured around the centre of See also:

• MOTION (Lat. motio, from movere, to move)
• MOTION, LAWS OF

motion, by which a See also:

• PLANET (Gr. ssXavirrns, a wanderer)

planet moving in an See also:

• ELLIPSE (adapted from Gr. EXkei 'tc, a deficiency, iXXeirely, to fall behind)

ellipse deviates from the mean position which it would occupy if it moved uniformly . Its amount is the correction which must be applied positively or negatively to the mean See also:

• ANOMALY (from Gr. lwvw)

anomaly in See also:

• ORDER
• ORDER (through Fr. ordre, for earlier ordene, from Lat. ordo, ordinis, rank, service, arrangement; the ultimate source is generally taken to be the root seen in Lat. oriri, rise, arise, begin; cf. " origin ")
• ORDER, HOLY

order to obtain the true anomaly . It arises from the See also:

• ELLIPTICITY

ellipticity of the See also:

• ORBIT (from Lat. orbita, a track, orbis, a wheel)

orbit, is zero at pericentre and apocentre, and reaches its greatest amount nearly midway between these points .