- I purchased your app, but my watch is still displaying the same face -- How do I see the faces on your app?
Use the main Wear OS watchface chooser to select a face (all of our face names start with "Emerald "). To access the chooser, press down and drag left or right when viewing a watch face. All the way to the right of the favorites row is an "Add more watch faces" button -- tap that to access the list of installed faces that have not yet been selected in the favorites row.
- The only face I see starting with "Emerald " is "Emerald DEMO". Where are all of the other faces you describe here?
If you download Emerald Chronometer (the free app), this is the only face that is initially available (Emerald Chronometer Pro, the paid app, includes all faces immediately when you buy it).
If you select "Emerald DEMO", it will run through a demonstration of all of the other faces. At any time, you can tap on the running demo to bring up buttons to pause, go back, go forward, or bring up the info panel.
From the info panel you can tap a button to buy (all 21 faces). The faces you purchase in this way will then be visible in the main face chooser alongside Emerald DEMO.
- The sunrise/sunset times are wrong.
The first thing to check is whether your device has the correct location, time, and time zone.
An easy way to check whether your watch is set up properly is to visit the device info panel. There you should verify three things:
If the location listed isn't correct, there are several possibilities:
- The time is approximately correct, including the month and day.
- The timezone matches your time zone (if this is wrong, we don't really know what the true time (UTC) is).
- Your location is approximately correct.
If the timezone on the device info panel isn't correct, you can go to your (watch) device's settings, and check the timezone setting. In most cases it should work to automatically set the timezone from the network, but if this isn't working, you can disable that option and set it manually.
- Your watch could be disconnected from its companion phone. Go to the Wear OS app on your phone, and make sure it shows your watch device and says "CONNECTED". If it doesn't, you'll need to fix this problem before Emerald Chronometer can
show the correct astronomical information. You may have luck with the instructions Google has provided here.
- If your watch is connected to the phone, but the location is still wrong, it might be that the Wear OS app on the phone has not been given permissions to use the phone's location:
- If your phone is an Android phone, the location permissions are in Settings under Apps & notifications -> App info -> Wear OS by Google -> Permissions.
- If your phone is an iPhone, go to the Settings app, then select Privacy -> Location Services, and make sure that "Wear OS" shows "Always" [allow location access].
- If you've followed the previous two suggestions but you still don't have the correct location, make sure your phone has the correct location. You can try going to Maps (Apple or Google) on your phone and make sure it's showing the right location.
- Finally, if all that looks right but the device info panel isn't, try installing Google Maps on your watch device and make sure it's showing the right location. Then switch back to the device info panel.
- If all that works but you still don't have the correct location in the device info panel, please send us an email at the address at the bottom of this page and we'll do our best to help you figure out what's going on.
If the time isn't correct, check the settings on your watch device (Settings -> System -> Date & time -> Automatic Date & time).
- Will Emerald Chronometer work without an Internet connection (eg. out in the
wilderness where even cell phone service is unavailable)?
- Yes, so long as the device has a way to get the accurate location. Time and location are all that we need;
all of the astronomy calculations are done
internally with no Internet required. In such situations you can put your device in Airplane Mode once it has gotten
the right location (you can check the device info panel to verify the location).
- Is there a version for the Apple Watch?
- No. Apple does not allow developers to create custom watch faces.
- These faces are expensive! And for such a small device!
Emerald Chronometer for Wear OS is the product of literally
years of part-time work by the developers designing, implementing,
documenting, and testing (we're a two-person company and we do it
all in-house). Even the "port" from our iOS phone product took
over a year, as it required adapting to a new form factor and OS, and more
importantly re-implementing the majority of code which was written
We don't expect to recoup the value of all that effort with our
sales on Wear OS, but we do believe it's a fair price for what you get:
- Beautiful designs that evoke real mechanical watches
- Very high-precision displays, with equally high accuracy
- All calculations done on-device without the need for the network
- Extremely high-efficiency implementation to save precious battery life
Fans of real mechanical watches know that the size of the object doesn't correlate with how expensive it is. :-)
- I'm seeing crashes (Emerald Chronometer just abruptly disappears or hangs).
This should be rare, but if it happens, here are some things to try, in order of increasing effort:
- If the face just disappears and is replaced with another face, try just selecting the desired face again.
- Go to Settings -> Apps & Notifications -> App Info. Select Emerald Chronomter (or Emerald Chronometer Pro if you have that installed). Then click "Force Stop" and confirm on the next panel. Now select your watch face again from the main face chooser.
- If that doesn't work, you can try restarting your device (Settings -> System -> Restart). Then select the face again, if necessary, from the main face chooser.
- If that doesn't work, you can try reinstalling the app. Go to Settings -> Apps & Notifications -> App Info - Emerald Chronomter as in the previous suggestion, but this time click "Uninstall" and confirm. Note that Google will sometimes trigger a refund if you do it within an hour or two of purchasing the app, so you may need to re-purchase the app, but your net cost should be zero for the reinstall. Please also send us an email (it's at the bottom of this page) if you have to go this far, as we'd really prefer that our customers never have to do this so we'd like to know when it happens.
- If you're still having trouble, please send us an email at the address at the bottom of this page, and we'll do our best to get it working for you.
- Mauna Kea shows the Sun in Cancer on Aug 3 but Cancer is June 23 – July 22.
- It's because of the precession of the equinoxes and the inaccuracy of the calendar prior to the Gregorian Reform of 1582.
Mauna Kea's zodiac dial shows the present astronomical positions of the
constellations which have changed considerably
from their positions when the astrological dates were fixed in ancient times.
- But Mauna Kea doesn't seem to quite match the astronomical constellations, either.
- Right. MK divides the zodiac into twelve equal sections and labels each one with a constellation.
The actual constellations are not all the same size, so MK's labels are only approximate.
The numbers in between each constellation label, however, do accurately indicate
(measured in hours).
Basel shows the actual constellation boundaries (for the present epoch).
- Your definition of "complications" is different than the one used in Wear OS (and Apple Watch, for that matter).
- The use of the word "complication" in the context of a watch predates smart watches by a century or two. :-)
It's a term of art in the horology (fancy watch) world, and refers to any watch display other than
hours, minutes, and seconds (and sometimes simple day/date). See:
The collection of faces contained in Emerald Chronometer has a very large number of complications; here's a list.
- The times for moonrise and moonset are not consistent between the various faces.
- Emerald Chronometer uses different rules for the "ring"-type displays like Mauna Kea and for the "dial"-type displays like Haleakala:
The "dial"-type displays use rise and set times for the current day
(i.e. the day shown in the date windows),
except in cases when the event doesn't happen on that day in which case it
just displays 00:00 (this happens a couple times a month for the Moon and
in summer and winter at high latitudes for the Sun). The values are updated at midnight.
On the "ring"-type displays, we use a more complicated algorithm but the result is simpler.
The rings show the closest rise and set time to the current time
without regard to the day or whether that's before or after the current time.
(In detail: if the Sun is above the horizon then the sunrise indicator shows
the time of the previous sunrise and the sunset indicator shows the next sunset; but if it's nighttime then
the sunset indicator is shows the time of the last sunset and the sunrise indicator shows the time of the
upcoming sunrise. The sunrise time is updated at sunset and vice versa. Similarly for the Moon.)
Since the times of sunrise and sunset change by only a few minutes
per day the differences between the two rules are small. But the times of moonrise and moonset change by about an hour each day so the differences are readily apparent.
- OK, but Padua seems to be different from either the Ring or Dial rules.
Because Padua only has a single horizon indicator for all of the
planets (we use "planet" to refer to the Sun and Moon too, in this
context), it is only a rough indication for any particular planet and
can be wrong in certain situations; use Venezia if you want precise
information. Specifically, the horizon indicator shows only the
azimuth of the intersections of the ecliptic plane with the horizon,
and thus is only exact when read against the Sun hand (or
against another planet's hand if the planet happens to lie exactly in the plane of the
ecliptic). If the planet is outside the ecliptic plane (that is, if
its ecliptic latitude is nonzero), then the horizon indicator for that
planet can be wrong in two circumstances:
* Close to the time of rise or set
* Close to the time when the ecliptic plane passes through the zenith, as it does in tropical latitudes.
bottom line is that the horizon mask should be taken as a rough guide
only. Use Venezia if you want more precise info.
- When Haleakalā (and Venezia) show the exact time of sunrise, the altitude hand for the Sun is a little below zero (and the same for moonrise and the altitude of the Moon).
- Yes, that's right. Sunrise is defined to be the time at which the first bit of the Sun's disk is visible. But the Sun's altitude is defined as the altitude of the center of the disk. It takes several minutes for the Sun to move that far.
- I have a real watch that displays the Equation of Time. It shows a value that's not the same as yours.
- We adopt the convention that a positive number means the sundial will show a later time than an ordinary clock.
EOT = sundial time - standard time
Some watches use the opposite convention. Learn more about the Equation of time here:
- My eyes aren't what they used to be and some of those dials and hands are awfully small. Can you implement a zoom feature?
Wear OS actually has a nice built-in zoom feature. Go to
Settings -> Accessibility and turn on "Magification Gestures". This
will allow you to triple-tap to zoom into an area of the watch. And
if you hold the final tap ("tap tap hold") you can then drag your
finger around the face to see the various features.
- Why is it asking to use my location?
- Emerald Chronometer needs to know your location in order to compute various astronomical quantities (eg. sunrise time). That's all we use it for. The data is stored on your device only. We do not transmit it anywhere. We do not sell it to anyone. We update it about every thirty minutes (sometimes more often if something else on the device is also using the location).
- Since I bought Emerald Chronometer, I've started getting spam about watches!
Emerald Sequoia has not ever sold, nor will we ever sell, email addresses of our customers
or of anyone else who contacts us via email. We hate spam as much as you do.
- It sure would be nice if ...
- Don't hesitate to send us enhancement requests or ideas for new faces.
Some of the ideas we've gotten have been really interesting!
We're only a two-person company doing this part-time, so we can't promise if or when any particular request will be implemented.