====== Martin Braun Boreas ======
{{wst>image_cr|Martin Braun|Boreas 42 MOP Royal}}

{{wst>image_cr|Martin Braun|Boreas 42 S}}

**Boreas** is a wristwatch by [[Martin Braun]].

[[Astronomical watch]] with [[automatic]] winding, which can indicate the [[sunrise and sunset]] times as well as the [[equation of time]]. For a correct display each watch is individually adjusted to the place specified by the buyer. This watch, as usual with Martin Braun, can be obtained in several versions that differ primarily through the dial and the [[bezel]]. On the left side there is the dial indicator for the sunrise periods, on the right for the sunset times. Since this is an astronomical display, daylight saving time is not considered.

Overall, the watch is very similar to the [[Martin Braun EOS|EOS]], which is also reflected by its name Boreas in Greek mythology is the child of Eos, the goddess of the dawn. The main difference from the EOS is the additional indicator of the equation of time, an astronomical [[complication]], which indicates the difference from the mean local time to true local time.


<WRAP ud ud_mod>

**Movement: **
  * [[Self-winding]] movement [[MAB 88]]
  * 25 [[jewels]]
  * Hand-engraved, [[rotor]] with [[Geneva stripes]]
  * [[Perlage]]-finished bridges
  * [[Blued]] screws
  * Power reserve 42 h

**Case:**
  * Optional [[stainless steel]] polished, [[rose gold]], [[white gold]] or [[platinum]]
  * Ø 42.0 mm, H 12.5 mm
  * [[Sapphire crystal]]
  * Screwed transparent caseback
  * [[Waterproof]] to 30 m
  * Models with [[mother of pearl]] dial and blue dial with [[bezel]] set with 66 [[diamonds]] of 2.31 carat in total

**Dial:**
  * Black, Blau, silver, each with [[guilloche]] pattern or bright blue mother of pearl dial 

**Functions:**
  * Hours, minutes, date
  * [[Sunrise and sunset]] times
  * [[Equation of time]]

**Bracelet: **
  * Hand-sewn Alligator leather strap in different colors, [[tang-type buckle]], optional [[stainless steel]], polished or [[rose gold]] or [[white gold]]
</WRAP>

{{tag>Watch_models Martin_Braun_models Astronomical_watches Watches_with_equation_of_time}}