- Geocentric or topocentric positions can be used.

When calculating topocentric phenomena, right ascension may be converted into hour angle as an intermediate step.

The topocentric system can also be described as an approximation algorithm for the Placidus system.

Topocentric houses are also called Polich-Page, after the names of the house system creators, Wendel Polich and A. Page Nelson.

Note that all dates and times in this section, and in the table, are in UTC, all celestial positions are in topocentric apparent coordinates, including the effects of parallax and refraction, and the lunar phase is shown as the fraction of the Moon's disc which is illuminated.