Celestial watch : Astrodea

Astrodea : the world's rare celestial watch that can display preciseness celestial motion made by CITIZEN. Astronomical Diagram from the Earth.celestial motion That show the allocation of constellation, position of the sun and the moon, the age of the moon automatically. It starts from the First MOONSIGN watch in 1984, then BASEL1986 model dislpied as sample model at BASEL fair, next COSMOSIGN series mass-produced in winter 1986, 2nd COSMOSIGN watch in 1987. And now refreshed new Astrodea series becomes fall 2005 !! Here I introduce the 'New Moon Age' model of Astrodea that can display position of the sun and the moon.
  • CITIZEN CAMAPANOLA COSMOSIGN Constellation model

    CITIZEN 2016-11 JPY 302,400

    Constellation position display. All-sky constellation display of 35 degrees north latitude. Of grade 4.8 or more of brightness, 1027 pieces of stellar display. 166 pieces of nebulae, star clusters display. By moon board, moon age display. Display of the sunrise and sunset time. The position of the moon. Battery life of about three years.

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  • CITIZEN CAMAPANOLA COSMOSIGN Moon age model

    CITIZEN 2016-11 JPY 270,000

    By moon panel and 24-hour panel, reading of Moon age. Display of the sunrise and sunset time and the position of the sun. Display of the moonrise and moonset time and the position of the moon. Battery life of about three years.

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New Moon Age model : Cal.4P85

New Moon Age model:CALIBRE 4P85 can display position of the sun and the moon, the age of the moon using two (large and small) dials(photo). This watch has accuracy than normal Moon phase watch intermittent working 29.5 day cycle. If you set the age of the moon exactly first, then it keeps the age error under +-0.1 until next battery change (three years).
11 Moon phases are depicted in the '24h dial'. This '24h dial' goes into a 360-degree roll clockwise in 24h and shows position of the sun and the moon. And small 'Moon age dial' is located inside. This 'Moon age dial' rotates 360-degree in 29.52 days towards to '24h dial' and show the age of the moon. Many informations are drawed on the '24h dial', and you can peruse following celestial motions from it.
  • Moon age / Moon phase / ebb and flood
  • altitude and direction of the moon
  • altitude and direction of the sun
  • darkness of the sky, astronomical twilight
  • Local apparent Sidereal Time
  • altitude and direction of the Sirius
  • altitude and direction of the Arcturus

(C) CITIZEN / ASTRODEA

peruse of the New Moon Age model

Moon age dial
This photo is a 'Moon age dial' locates on the center of the watch. This dial goes into a 360-degree roll counterclockwise in 29.52 days vis-a-vis '24h dial'. And the triangular shape arrowhead on the dial points up present moon age.
Dots and numerics drew around the dial means moon age. You can read The moon age 21.4 from photo.
transparent dial
This photo is a 'transparent dial'. This dial was fixed, and show the altitude azimuth of The Sun and The Moon at latitude of 35 degrees north.
Curved line of vertical direction means azimuth. Center vertical line (marked 'S') means south sky. And left 'SE' means southeast direction, 'E' means east, 'SW' means southwest, 'W' means west.
Curved line of horizontal direction means altitude. Altitude and azimuth was parted every 15 degree. Five curved lines means 15, 30, 45, 60, 75 degree altitude.
And the concave line drew lower harf of the dial means 'altitude -18 degree line'. You can know the time of astronomical twilight from this figure.
Moon age / Moon phase / ebb and flood
You can know Moon age / Moon phase / ebb and flood from the triangular shape arrowhead on the 'Moon age dial'. Thist photo show the 21.2 of Moon age, and signalling the Moon phase of old harf moon.
Ebb and flood are perceived from moon age. New moon(age zero) and full moon(age 15) means spray tide. Quarter moon(age 7, age 22) means neap tide.
altitude and direction of the moon
altitude and direction of the sun
darkness of the sky, astronomical twilight
Local apparent Sidereal Time
altitude and direction of the Sirius and the Arcturus
How to use the register ring