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Topocentric Aspect Ephemeris

A Topocentric Aspect Ephemeris study generates planetary positions and angular relationships between body pairs from a specific location on Earth's surface. It combines the parallax-aware accuracy of topocentric calculations with the angular relationship tracking of aspect ephemeris studies.

Creating a Topocentric Aspect Ephemeris Study​

You can create a new Topocentric Aspect Ephemeris study in either of these ways:

  • Click the Topocentric Aspect Ephemeris button on the toolbar
  • Select Ephemerides > Topocentric Aspect Ephemeris from the menu

A new study appears in the studies list with the same tabbed configuration interface as the Geocentric Aspect Ephemeris.

Configuration​

The Topocentric Aspect Ephemeris uses the same configuration parameters and tabbed layout as other aspect ephemeris studies:

  • Study configuration fields -- Study Name, Location, Zodiac, Ref. Plane, Date Range, Interval
  • Inner & Outer Bodies tab -- Select inner (faster-moving) and outer (slower-moving) bodies
  • Body & Aspect Metrics tab -- Select positional and aspect metrics

The coordinate origin is fixed to Topocentric. The selected location determines the observer position for all calculations, affecting both positional data and angular relationships.

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The location selection is particularly important for topocentric studies. Different observer locations produce different positional results, especially for the Moon.