Passing Close
More generally, in the particular case of two planets, it means that they merely have the same right ascension (and hence the same hour angle). This is called conjunction in right ascension. However, there is also the term conjunction in ecliptical longitude. At such conjunction both objects have the same ecliptical longitude. Conjunction in right ascension and conjunction in ecliptical longitude do not normally take place at the same time, but in most cases nearly at the same time. However, at triple conjunctions, it is possible that a conjunction only in right ascension (or ecliptical length) occur. At the time of conjunction – it does not matter if in right ascension or in ecliptical longitude – the involved planets are close together upon the celestial sphere. In the vast majority of such cases, one of the planets will appear to pass north or south of the other.
Read more about this topic: Conjunction (astronomy)
Famous quotes containing the words passing and/or close:
“The unpleasant events you are passing from will not have been profitless to you.”
—Abraham Lincoln (1809–1865)
“What men call social virtues, good fellowship, is commonly but the virtue of pigs in a litter, which lie close together to keep each other warm.”
—Henry David Thoreau (1817–1862)