What's New

Bug fixes

App Description

Emerald Observatory displays a wealth of astronomical information all on one screen, in a unique but understandable format. Information includes:

- 12- and 24-hour ordinary clock time
- Times of rise and set for the Sun, the Moon, and the 5 classical planets
- Times of the beginning and ending of twilight
- Heliocentric orrery (display of the planets in orbit around the Sun)
- Altitude and azimuth for the same bodies (one body at a time)
- Current phase and apparent orientation and relative size of the moon
- Current regions of day and night on a world map
- The Equation of Time, solar time, UTC time, and sidereal time
- Month, day, year, and leap-year indicator
- Daily alarm (delivered as local notification on iOS 4+ if app is not running)
- Eclipse simulator
- Displayed times are synchronized via NTP to "atomic clock" standard
- Uses iPad location, or the latitude and longitude may be set manually

A setting is available to allow the display to stay on continuously.

Tap on the display to move forward by a month, day, year, hour, or minute. A detailed manual for the operation of Emerald Observatory can be found at the "Emerald Sequoia LLC Web Site" listed below, at http://emeraldsequoia.com/eo/

If you are having any trouble with the application whatsoever, please see our FAQ on the support page listed below and then contact us through that page if your problem is not resolved. We take pride in responding promptly to all support email requests but we can't fix it if you don't report it (and we have no way to respond to Customer Reviews on iTunes).

(NTP requires Internet access. Like all apps Emerald Observatory can not change the device's internal clock.)

iPad Screenshots

(click to enlarge)

Emerald Observatory for iPad screenshot 1 Emerald Observatory for iPad screenshot 2 Emerald Observatory for iPad screenshot 3 Emerald Observatory for iPad screenshot 4 Emerald Observatory for iPad screenshot 5

App Changes

  • June 24, 2011 New version 1.3.1
  • August 13, 2011 New version 1.3.2
  • January 08, 2012 New version 1.3.4
  • March 16, 2012 New version 1.3.5
  • April 20, 2012 New version 1.3.6
  • September 14, 2012 New version 1.3.7
  • September 26, 2012 New version 1.3.8
  • September 06, 2013 Price decrease: $0.99 -> FREE!
  • September 08, 2013 Price increase: FREE! -> $0.99
  • October 25, 2013 New version 1.4
  • December 01, 2016 New version 1.4.1
  • June 15, 2019 New version 1.4.3

Other Apps From Emerald Sequoia LLC

Emerald Chronometer Emerald Geneva Emerald Time Emerald Timestamp Emerald Chronometer HD