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For inspiration: apparently it is possible to fit quite a few astronomical features into a mechanical wristwatch:

https://www.vacheron-constantin.com/ww/en/watches/novelties/cabinotiers-solaria.html

From https://robbreport.com/style/watch-collector/vacheron-constantin-most-complicated-wristwatch-in-world-1236442818/ :


Every Complication in Les Cabinotiers Solaria Ultra Grand Complication-La Première
Time Measurement

Day and night indication for reference city
Second time zone hours and minutes (on 24-hour display)
World time indication for 24 cities
Second time zone day and night indication
3 Hz tourbillon with silicon balance wheel
Civil time display module coupled to the base movement

Gregorian Perpetual Calendar

Perpetual calendar
Days of the week
Date
Months
Year indication
Leap-year indication
Indication for the number of the week within the year
Number of the day of the week

Lunar Indications

Astronomical moon phase and age of the moon
Tide level indicator
Spring and neap tides indication

Astronomical Indications

Indications of seasons, equinoxes, solstices and astronomical zodiac signs
Position of the sun
Sunrise time (according to the city of reference)
Sunset time (according to the city of reference)
Duration of the day (according to the city of reference)
Equation of time on tropical gear
Culmination time of the sum (according to the city of reference)
Height of the sun above the horizon (according to the city of reference)
Declination of the sun, 3-dimensional Earth showing the latitude of the sun in the North (TK)
Sidereal hours
Sidereal minutes
Astronomical zodiac signs
Sky chart (according to the city of reference)
Temporal tracking of celestial objects

Chiming Complications

Minute repeater
Westminster carillon chime (four hammers and four gongs)
Choice of hour-only or full chime
Crown locking system during the chiming
Double-stop hammer system to limit rebound and optimize transmission

Chronograph

Chronograph (one column wheel)
60-minute counter
Split-seconds chronograph (one column wheel)
Isolator system for the split-seconds chronograph

Additional Features

Power reserve indication