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eBook from the Gutenberg Project consists of approximately
53 pages of information about Kepler.  Apse:  An extremity of
the major axis of the orbit of a body; a body is     at its
greatest and least distances from the body about which it
    revolves, when at one or other apse.  Conjunction:  When a
plane containing the earth’s axis and passing     through the
centre of the sun also passes through that of the moon     or a
planet, at the same side of the earth, the moon or planet is in
    conjunction, or if on opposite sides of the earth, the moon
or     planet is in opposition.  Mercury and Venus cannot be in
opposition,     but are in inferior or superior conjunction
according as they are     nearer or further than the sun.
Deferent:  In the epicyclic theory, uneven motion is represented
by     motion round a circle whose centre travels round another
circle, the     latter is called the deferent.  Ecliptic:  The
plane of the earth’s orbital