Emerald Observatory for iPad at Mac App Store analyse

App power index: 100 (based on ranks around App Stores today)
Utilities Education
Developer: Emerald Sequoia LLC
Price: 0 free
Current version: 1.5.5, last update: 1 year ago
First release : 01 Apr 2010
App size: 15.84 Mb
4.2 ( 7232 ratings )
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Estimation application downloads and cost

> 2.2k
Monthly downloads
~ $ 900
Estimation App Cost


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 cant fix it if you dont 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 devices internal clock.)
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Available in countries
Country Price
Canada free
China free
France free
Germany free
Italy free
Netherlands free
Portugal free
Spain free
Poland 1.09 EUR
UK free
India free
Japan free
Korea, Republic Of free
Poland free
Russia free
Turkey free
USA free
Korea, Republic Of 1.09 USD
Ukraine free
Available for devices
iPad2Wifi, iPad23G, iPadThirdGen, iPadThirdGen4G, iPadFourthGen, iPadFourthGen4G, iPadMini, iPadMini4G, iPadAir, iPadAirCellular, iPadMiniRetina, iPadMiniRetinaCellular, iPadAir2, iPadAir2Cellular, iPadMini3, iPadMini3Cellular, iPadMini4, iPadMini4Cellular, iPadPro, iPadProCellular, iPadPro97, iPadPro97Cellular, iPad611, iPad612, iPad71, iPad72, iPad73, iPad74, iPad75, iPad76, iPad812, iPad834, iPad856, iPad878, iPadMini5, iPadMini5Cellular, iPadAir3, iPadAir3Cellular, iPadSeventhGen, iPadSeventhGenCellular, iPadProSecondGen, iPadProSecondGenCellular, iPadProFourthGen, iPadProFourthGenCellular,