====== A. Lange & Söhne 1815 Moonphase ======
{{wst>image_r|A_Lange_&_Söhne_1815_Mondphase|A. Lange & Söhne 1815 Moonphase ([[red gold]])}}
{{wst>image_r|A_Lange_&_Söhne_1815_Mondphase_RS|A. Lange & Söhne 1815 Moonphase (back)}}
{{wst>image_r|A_Lange_&_Söhne_1815_Mondphase_Platin|A. Lange & Söhne 1815 Moonphase ([[platinum]])}}

**1815 Moonphase** is a luxury watch by [[Lange Uhren GmbH|A. Lange & Söhne]].

On the occasion of the 150th anniversary of Emil Lange in [[1999]], this watch was presented. The [[moon phase]] indication is exactly calculated to deviate only one day of the synodic orbital period in 1000 years - provided that the watch would run continuously and with accurate time setting. Because of this extreme precision, the display is not set exactly on the day, but with the help of an accurate moon age-table on an hourly basis. This small astronomical wonder is accommodated in a [[movement]] only 3.85 mm in height and with a diameter of 27.5 mm.

Thus, the solid silver dial of this horological rarity deserves a closer look. Seven golden appliques represent the constellation of the "Big Dipper". Beneath the central pole star, called Mizar, sits the small Alcor, which was used in the Middle Ages as a test object for good visual acuity. This is an interesting, hid detail that only a privileged circle of owners of the **1815 Moon Phase** can observe , beause it is limited to 250 pieces in [[red gold]] and 150 pieces in [[platinum]]. It was manufactured from [[1999]] to [[2000]].

<WRAP ud ud_mod>
**Reference:**
  * 231.031 ([[red gold]]), 231.035 ([[platinum]])

**Movement:**
  * [[Manual winding]] Calibre [[Lange L943|L943.1]], [[moon phase]] indication, [[small second]] with [[hacking seconds]]

**Case:**
  * Ø 35.9 mm, height 7.5 mm
  * [[Sapphire crystal]], [[sapphire crystal]] caseback

**Dial:**
  * Solid silver

**Bracelet:**
  * Crocodile leather strap

**Limited edition:**
  * [[Red gold]] 250 pieces, [[platinum]] 150 pieces
</WRAP>

{{tag>Watch_models Watches_with_moon_phase A._Lange_&_Söhne_models A._Lange_&_Söhne_1815_models}}