Emerald Chronometer4.1 - App Store

These models of high-end mechanical watch faces contain many of the most complex "complications" found in real watches, plus refinements found nowhere else. All displays maintain the look and feel of real mechanical objects, but with the time and location accuracy of the iPhone.

NOTE: This app (Emerald Chronometer) is optimized for the iPhone and iPod touch. Please also see Emerald Chronometer HD, a separate product optimized for the iPad.

Astronomy features:
- Highly accurate data from 4000 BCE to 2800 CE
- Times of rise and set for the Sun, the Moon, and the 5 classical planets
- The correct shape and orientation of the Moon in all phases but still using a mechanical display
- Relative positions of the Sun, Moon, 6 planets and the constellations of the zodiac
- "Compass functions" show the elevation and azimuth of the Sun, the Moon, and the 5 planets
- The Equation of Time, solar time and sidereal time
- Eclipse predictor (lunar node indicators and separation indicator)
- User settable geographic location and timezone using an 80,000 city database
- A unique face showing the rise and set times of all 5 classical planets plus the Sun and the Moon at once

Clock features:
- Day/date/month/year indicators, using mechanical wheels
- Local and UTC time
- Chronograph (stopwatch) with split timer, 1/10 sec accuracy
- Alarm clock and interval timer; notifications are delivered in iOS 4 if the app is not running**
- World-time watch with 24-city ring on one side and 4 subdials on the other
- Calendar watch with rotating wheels showing a full month at a time
- Most watches with 1/5 sec or 1/10 sec precision
- Synchronized with standard atomic clocks via NTP

There are 16 watches in all, with 27 total watch faces (including front and back sides).

A setting is available to allow the display to stay on only when plugged in.

Play with the watches by tapping on the crown and moving the hands, or press and hold on a date window to zoom through time to see the effect on the heavens. Then just use them to show you when it's time for a break.

A complete description of each application feature can be found in the built-in Help screens and on the Emerald Sequoia LLC Web Site, which also includes a demo movie. A developer's blog may also be found at http://emeraldsequoia.com/esblog/ .

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.

**NTP accuracy is not guaranteed for alarm delivery if the app is not running. (NTP requires Internet access. Like all apps Emerald Chronometer can not change the device's internal clock.)

Version History Optimized for iOS 26, this version has the same original watch faces. 4.1 May 5 * Built against latest development SDK
* Includes some watches from the developers' workbench 3.12.2 10/23/2023 Warning about company shutdown 3.11.1 09/04/2023 - Support for Dark Mode
- Support for iOS 15 3.10.1 11/07/2021 - Fix UT minute hand on Geneva when local time has a TZ offset which is not an even hour multiple. 3.9.8 07/05/2020 - Compatibility with latest development tools
- Misc bug fixes 3.9.7 01/26/2020 - Support for iPhone X
- Miscellaneous bug fixes 3.9.6 11/27/2018 - Support for iOS 10
- Miscellaneous bug fixes 3.9.5 04/17/2017 * Fix crash running under iOS 7.x
* Fix Local Notification issues (double notifications, inappropriate notifications) 3.9.4 10/22/2015 * Fix missing local notifications for alarms (when app is not active) on newly-installed apps in iOS 8+
* Fix early termination of local notifications 3.9.3 10/12/2015 - Fix black screen at startup on iOS 8 devices.
- Miscellaneous minor bugfixes. 3.9.1 01/16/2015 3.9:
- Support for iOS 7
- Various minor aesthetic improvements and bug fixes 3.9 10/25/2013 - Fix occasional delayed alarm on Thebes when returning from background with NTP disabled or unavailable
- Various minor aesthetic improvements and bug fixes 3.8 06/15/2012 3.7.2:
- Reduce footprint on devices with 256 MB RAM
- Tell iOS 5+ not to back up generated files

3.7:
- New watch "Babylon" with full-month calendar
- Two-stage reset button on Thebes (interval timer)
- Show Mauna Kea's and Terra's fixed moons with south up for southern observers
- Additional button on Miami back to cycle planets in opposite ordert
- Various minor aesthetic improvements and bug fixes 3.7.2 02/16/2012 3.7:
- New watch "Babylon" with full-month calendar
- Two-stage reset button on Thebes (interval timer)
- Show Mauna Kea's and Terra's fixed moons with south up for southern observers
- Additional button on Miami back to cycle planets in opposite ordert
- Various minor aesthetic improvements and bug fixes 3.7 02/01/2012 3.6.3:
- Increase beat frequency of some watches to more closely match real-life watches
- Various minor aesthetic improvements and bug fixes

3.6.1:
- Allow tapping the AM/PM window in Istanbul when in SET mode to switch between AM and PM.
- Longer Local Notification sound for when the app is in the background.
- Restore missing eclipse indicator dial arc
- Various minor aesthetic improvements and bug fixes

3.6:
- Link to Emerald Chronometer HD, a separate product
- Center the transparent "current city" indicator at the top of Terra
- Elapsed-days hands on Olympia enable timing intervals up to 12 days
- Various minor aesthetic improvements and bug fixes 3.6.3 08/31/2011 3.6.1:
- Allow tapping the AM/PM window in Istanbul when in SET mode to switch between AM and PM.
- Longer Local Notification sound for when the app is in the background.
- Restore missing eclipse indicator dial arc
- Various minor aesthetic improvements and bug fixes

3.6:
- Link to Emerald Chronometer HD, a separate product
- Center the transparent "current city" indicator at the top of Terra
- Elapsed-days hands on Olympia enable timing intervals up to 12 days
- Various minor aesthetic improvements and bug fixes 3.6.1 06/08/2011 3.6:
- Link to Emerald Chronometer HD, a separate product
- Center the transparent "current city" indicator at the top of Terra
- Elapsed-days hands on Olympia enable timing intervals up to 12 days
- Various minor aesthetic improvements and bug fixes 3.6 05/07/2011 - New hands for Haleakala and Chandra
- Fix occasional crash when re-entering from background
- Various minor aesthetic improvements and other bug fixes 3.5 03/15/2011 3.4:
-- In-app printing of Help pages on iOS 4.2+ devices
-- Various minor aesthetic improvements and bug fixes 3.4 12/28/2010 3.3:
-- New high-resolution artwork for Retina display on iPhone 4
-- Various minor aesthetic improvements and bug fixes 3.3 11/15/2010 3.2.2:
- More useful azimuth display at poles
- Fix stuck "Loading" message after flipping front/back or day/night

3.2.1:
- Local Notification sound for iOS 4 now identical to normal alarm sound (increased length and volume)

3.2:
- Alarm improvements including Local Notifications for iOS 4
- Improved time base stability
- Slightly improved reliability of "Disable Auto-Lock"
- Calendar code now independent of changes to OS calendar database prior to 1582 AD
- Various minor aesthetic improvements and bug fixes 3.2.2 08/09/2010 3.2.1:
- Local Notification sound for iOS 4 now identical to normal alarm sound (increased length and volume)

3.2:
- Alarm improvements including Local Notifications for iOS 4
- Improved time base stability
- Slightly improved reliability of "Disable Auto-Lock"
- Calendar code now independent of changes to OS calendar database prior to 1582 AD
- Various minor aesthetic improvements and bug fixes 3.2.1 07/08/2010 3.2:
- Now optimized for iOS 4
- If the device is running iOS 4, alarm notifications will be delivered even if the app is not running
- Improved time base stability
- Slightly improved reliability of "Disable Auto-Lock"
- Calendar code now independent of changes to OS calendar database prior to 1582 AD
- Various minor aesthetic improvements and bug fixes 3.2 06/17/2010 3.1.1:
- A few new cities for unrepresented time zones

3.1:
- New world-time watch (Terra)
- Tap location and NTP status indicators to see details
- Holding down on windows now accelerates slowly but continuously rather than suddenly going faster
- Holding down on year windows in Set mode now accelerates to a faster rate for easier access to distant years
- UTC indicator on Vienna
- Fix bug where timezone failed to update at startup in auto mode
- Help page now linked to developers' blog
- Various minor aesthetic improvements and bug fixes 3.1.1 05/04/2010