(click for full size image)
In addition to ordinary time and date, Emerald Observatory displays a wealth of astronomical information all on one screen, in a unique but understandable format. Information includes:
- 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 relative apparent 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
- Displayed times are synchronized via NTP to "atomic clock" standard
- Uses iPad location, or the latitude and longitude may be set manually
- Option to force the display to stay on continuously
The time can be set to any date from 4000 BCE to 2800 CE. The clock can be animated at high rates to more easily see the changes in long term astronomical variables such as the seasons and moon phases. A detailed description manual for the operation of Emerald Observatory can be found at the Emerald Sequoia LLC web site at http://emeraldsequoia.com/eo/. Emerald Observatory is priced at just $0.99 and is available now at Apple's App Store here.
(Full size image available on request.)