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August 22, 2015
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iOS Display Settings
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iOS Ephemeris Settings

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Geocentric / Topocentric / Heliocentric

  • Used by all features to determine which type of data to display.
  • Charts/Horoscopes use this setting as the default during creation but it can be changed for individual Charts at anytime using a similar button at the bottom of the Chart editor view.
  • Topocentric and Heliocentric capabilities are enabled as part of the Extended Ephemeris In-App purchase.
  • Geocentric – most users should use this.
  • Topocentric – the view of the sky from the surface of the Earth at the exact location and elevation at that spot. Topocentric data requires elevation and iPhemeris will attempt to look it up from a NASA global elevation database after you set the location using the Map. This settings makes a very minor and inconsequential difference to the position of the moon for some charts at particularly high elevations (however people asked for it, so there ya go).
  • Heliocentric – the view of the heavens from the Sun. Some commodity markets traders like to use this.

Tropical / Sidereal:

  • Applies to most iPhemeris features. Charts use the value as a default but it can be changed for individual Horoscopes from the Chart editor.
  • Sidereal requires an Ayanamsa other than Tropical to be selected in order to notice any difference.

Ayanamsa:

  • This is a global setting and any feature displaying Sidereal data uses this setting.
  • Tap the Ayanamsa row to choose a pre-defined Ayanamsa and/or use your own value.
  • To set your own value choose Your Ayanamsa at the bottom of the ayanamsa list.
  • The degree offset from Tropical positions for pre-defined Ayanamsa are listed at the end of this documentation. Values shown are for Epoch Jan. 1 2000. iPhemeris adjusts that value to the date of the Chart or Table. It does this using the mean rate of annual precession (0.01396887831940 degrees per year).
  • Nakshatra Note: This setting is also used by the Nakshatra chart wheel style (see Chart Settings).

Using Your Own Ayanamsa:

  • Tap Ayanamsa row.
  • Scroll to the bottom of the ayanamsa list and select Your Ayanamsa.
  • Tap Settings button to save.
  • Tap the row titled Your Ayanamsa and enter your value for midnight Epoch Jan. 1 2000.
  • To calculate the correct value: ValueNow – ((CurrentYear – 2000) * 0.01396887831940).

Lunar Nodes, Black Moon (Lunar/apogee/Lilith): A global setting the determines if TRUE or MEAN value is used.

Precision: Toggle display of Ephemeris data between DD.MM.SS and DD.MM.

Time Zone:

  • Uses standard Time Zone notation. Locations East of Greenwich are positive (+) and West negative (-).
  • The Ephemeris does not automatically adjust for Summer/Winter time.
  • This Time Zone setting applies only to Ephemeris Displays and Calendars.

Hour: Sets the hour in the Time Zone for Ephemeris and Calendar displays. E.g. if the Ephemeris Time Zone is set for GMT (0) and Hour is set to 12:00, tables display Noon GMT positions.