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Emerald Observatory App for iPad

on June 30, 2010 9:00 am

The Emerald Observatory app for iPad from Emerald Sequoia LLC is a clock and so much more.  In addition to the 12-hr and 24-hr analog time, you can see a heliocentric orrery (display of planets in orbit around the sun) and their rise/set times and altitude and azimuth.  You can determine the beginning and ending of civil, nautical and astronomical twilight, the “golden hour” when the sun is 15 degrees above the horizon and the light is generally best for outdoor photography, the equation of time, leap years, and a time zone indicator.  The inner subdials show UTC, sidereal, and solar time.  There’s also a photographic representation of the lunar phase and apparent size, and a geochron-type display of the earth’s daytime and night areas.  This information can be displayed for the current location or for any entered location and for the current time (as synchronized via NTP) or any time from 4000 BCE through 2800 CE.  You can set the program to be always on for a beautiful clock display.  The Emerald Observatory app is $0.99 from iTunes.


  1. 1
    1000Acres says:

    Just downloaded. This is awesome!

  2. 2
    Janet Cloninger says:

    @1000Acres The picture is a screenshot from my iPad. I got it yesterday – don’t know what most of the stuff is, but I had to have it. It reminds me of the Tellarium Clock I posted about some time ago, but I can afford THIS one.

  3. 3
    Andy Simmons says:

    Beautiful. Makes me want to buy a second iPad to mount on the wall and run this all the time.

  4. 4

    Nice find!!! We are addicted to clocks :-)

  5. 5

    [...] Sequoia LLC makes some wonderful clock apps for iPhone and iPad.  Earlier, I told you about the Emerald Observatory app for iPad.  Today it’s the Chronometer app for iPhone/iPod touch.  The Chronometer app [...]

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