Fitbit SimpleAstro Operations
(last update 2023-09-12 Version 5.3.46 (Versa 3 & Sense), 4.3.46 (Versa 2)
This clock face has 3 main views
Astrological view with Zodiac sign information and Analog display and stats
Digital complete date view and customisable stats
Main Astronomy view
Viewing position for the Sun and Moon
Important: When making any changes be patient while the clock face calculates the new situation,
about 1 minute is sufficient, or turn off/On the display for immediate calculation
This watch face shows the current position of the Sun and the Moon [with it's phases and orientation]
based on your actual location.
It normally derives your location from your phone.
It is necessary to do this once or set it manually, see later.
It will attempt to get your location from the phone the first or any time it starts
so make sure the Fitbit App is running and phone location is set on for best results..
Thereafter, the default is no automatic update.
Tip: When using the Astro view you may want the watch timeout set to 60s
Special notes on managing location
Generally it is not necessary to have automatic updates
unless you regularly move more than 50 miles away from the initial point.
This can be configured in clock face Settings in the Gallery tile on the phone if you want
to regularly update your current location, if moving long distances, or instead just request it when needed
To manually request a location update from the clock face any time.
Double tap the bottom of the screen.
The update process works like this:
Lat and Lng will be set to 0 then values should appear, they can be
It is also possible to manually enter the decimal coordinates directly in the Fitbit App
if you are unable to use phone location or want to enter a specific location.
If the latter, it is a good idea to turn off phone location
this avoids it getting the current location accidentally and
over writing the chosen values.
Manually enter location or changes settings
In the Gallery tile (of the Fitbit App) - click Settings
If you you change coordinates manually to another location it is best to turn off location on your phone
this will avoid getting your current location.
Tip: To quickly get your current location
Turn on phone location and double tap the bottom of the Astro display
Special notes - object placement - Astro views
The sun and moon placement may be presented in 5 different ways depending on the mode and their position.
Generally they are placed in a Spatial view, taking into account their Azimuth and Elevation and assumes a sky view of between East (90 degrees) and West (270 degrees)
There are 2 exceptions
1. When an object is above the horizon [Elevation is positive] and it's Azimuth is out side that range, the view switches to Panoramic view to try and show the objects above the horizon.
2. When Compass mode is enabled, if the object is between 90 and 270 degrees
it will switch to a pure Azimuth mode.
To denote this true Compass mode, the line to the sun will be red and to the moon yellow
and these can then be used for navigation purposes.
If a line is white it cannot be used for navigation as it is not in "true" Compass mode
but is an indicative mode used to help locate the objects.
Objects below the horizon use Orbital mode, using Azimuth only
When the Astro view is in Demo mode it advances in Orbital mode at 30 minutes per second.
To toggle Off/On Demo mode, triple tap the sky, by default it starts on.
Using "true" compass mode
The sun or moon can both be used for navigation in "true" Compass mode.
Make sure your watch horizontal to the ground.
Using the arm of your glasses or dark glasses to create a shadow, as in a sundial,
which aligns with the red line if using a sun shadow or yellow line for a moon shadow.
The green line will then point South or North as indicated.
If you don't have glasses you can use your body shadow.
Stand at right angle to your shadow and hold the watch to your chest
so that the red, or yellow, line is aligned with the shadow.
Precision may be less accurate in the polar circles and at the equator.
The blue line denotes the horizon, which is well below the mountains.
This explains why the sun and moon are not immediately visible
The green dome denotes the limits of East and West on the horizontal.
Fun facts: Special notes on North / South hemisphere and world
If you live in the Northern hemisphere you are looking South and
If you live in the Southern hemisphere you are looking North.
The world is populated in different regions as follows:
The equatorial circumference of Earth is about 40,075 km (24,901 miles)
Fun facts: Special notes about the moon
The shading of the moon varies depending on where you are and the sun position and should be accurately shown
The moon also changes it's distance from earth by about 50,000 kms
When it is closest it is called "Perigee", and furthest, "Apogee
The distance between the Apogee and Perigee is a 12.5% more than the Equator circumference
The next time a Full Moon is even closer to Earth will be on November 25, 2034 .
The average distance is about 382,900 kilometres (238,000 miles) from the Moon's centre to the centre of Earth.
The distance to the moon at Perigee is about the same as going around the Earth's Equator 90 times
5 Jul 2023, 00:24 - Distance: 360,149 km (223,786 miles)
20 Jul 2023, 08:56 -Distance: 406,289 km (252,456 miles)
The effect of distance change as seen from Earth
The moon loses about 3 degrees per day from it's position of the previous day at the same time, this means the earth will have rotated through 3 degrees more each time the moon rises.
Why is the moon upside down in the southern hemisphere?
The moon "tilt" is also shown depending on viewing location and time of day.
Using Demo mode you can see more clearly some of the things the moon does that
you may not normally notice.
Fun facts: Special notes about the full moon and phases
Using the various Astro screen modes
A triple tap will toggle the display in and out of Demo mode
When the clock face starts, or there is an automatic location update or a manually requested update
the words "Lat" and "Lon" will turn white for a moment and coordinates will be zero.
See notes on location earlier
Tip: Whenever the display is in Night mode click on the central moon to enlarge it.
If you click the enlarged moon it will stay.and briefly give distance and tilt
To remove the enlarged moon click on it.
In addition, in the enlarged view it will dynamically show briefly the current relative moon size,
Where Perigee is the biggest, closest moon and
Apogee is the smallest furtherest away moon
This demonstrates the relative distance though
the moon is still shown with the same enlargement for fit and accuracy
click the following link to see how it works.
2. Zodiac / Analog view
This specialised view has 4 modes
3. Digital view
Full date and time with stats
Configuring Digital mode
select the desired change, Submit and sync
Or same in the Fitbit App, App settings
another format for other countries
Battery [green, or low warning orange or red]
Double tap top right value - it will flash
While flashing each tap will advance to the next value of the following items:
Active Zone minutes [pink]
Additional language support
German - mehrsprachige deutsche Kurzdaten
Spanish - fechas abreviadas multilingües en español
French - dates multilingues français abrégées
Italian - italiano multilingue date abbreviate
Dutch - meertalige Nederlandse verkorte data
Norway - flerspråklige norske forkortede datoer
Swedish - flerspråkiga svenska förkortade datum
Switching to Astro mode
Tap on Digital view Minute to see the Astro view and
Switching to Analog/Zodiac mode
Tap on Digital view Hour to see the Analog and Zodiac view and
Switching to Digital mode
Tap on the Astro view bottom half or Analog/Zodiac central hub to see Digitial view
Dual Analog mode
Configuring Dual Analog mode
It is possible to advance the clock by 1, 7 or 30 days to make projections.
To do this switch to Analog mode
The projected offset is shown briefly in Analog and Digital views
Special watch Settings tips
For best effect try with watch settings
Apart from seconds, some updates happen only every minute, to speed this up
Usage limitations tips
Use in the Polar circles may produces less accurate results
Equatorial moon display is uncertain
Restart & Version
To see the version briefly
SimpleAstro releases (V4 - Versa 2, V5 - Sense, Versa 3)