====== Nomos Zeta ======
{{wst>image_r|Nomos_Zeta_ZB|Nomos Zeta (dial side)}}
{{wst>image_r|Nomos_Zeta|Nomos Zeta}}
The **Zeta** (ζ) is the first [[automatic]] movement with [[date window]] from [[Nomos]]. It was introduced in [[2006]] and remains in production [[as of 2019]].

===== Overview =====
The [[2005]] introduction of the [[Nomos Alpha|Alpha movement family]] was an important turning point for Nomos. Although based on the preceding [[Nomos 1 TSP]], it was largely constructed [[in-house]] rather than being a refinished [[ebauche]]. This was followed in [[2006]] by the Nomos Epsilon, the first Nomos movement with [[automatic winding]]. Both movements feature a gear train similar to the classic [[Peseux 7001]], but placed in a new enclosure based on the classic [[Glashütte]] [[three-quarter plate]] design. Nomos updated many of the components, adding [[hacking seconds]], and completely reworked the finishing with [[rhodium]]-plated surfaces, [[blued screws]], [[Glashütte Stripes]], and Glashütte [[solar grinding]] or [[Langeleist-Perlage]].

The automatic movements consist of [[Nomos Epsilon|Epsilon]], Zeta (with [[date window|date]]), and [[Nomos Xi|Xi]] (with [[GMT]] or [[world time]] disc). All three movements measure 13¾ [[ligne]] (31 mm) in diameter, but Epsilon is thinnest at 4.3 mm. Like the [[Nomos Beta]] and [[Nomos Delta|Delta]], the Zeta uses a [[date wheel]] mounted outside the movement rather than stacked between the [[bottom plate]] and the [[dial]]. This allows the movement to be just as thin as the non-date [[Nomos Epsilon|Epsilon]] version.

A direct successor to the Nomos Zeta was introduced in [[2017]], the [[DUW 5101]] featuring the [[Nomos Swing System]]. The Zeta calibre remains in production [[as of 2019]].

This movement is officially named using the Greek letter "ζ", but Nomos often writes it as "Zeta".

===== Zeta Version 2 =====
The first version of the Epsilon movement had 24 [[jewels]]. In May [[2007]], Nomos switched to a new version with 26 jewels. One wheel in the automatic winding system was set in two extra jewels, allowing better winding efficiency and durability thanks to reduced friction.

===== Applications =====
  * [[Nomos Ahoi date]]
  * [[Nomos Club automatic date]]
  * [[Nomos Ludwig automatic date]]
  * [[Nomos Tangomat date]]
  * [[Nomos Zürich date]]

===== See Also =====
This movement is part of a family of Nomos movements produced since [[2005]]. The movement is partially made [[in-house]], though the [[assortment]] is supplied by a third-party. It was supplanted by the in-house [[Nomos Swing System]] family starting in [[2014]].

    * [[Nomos Alpha]] Hand winding
    * [[Nomos Beta]] Hand winding, date
    * [[Nomos Delta]] Hand winding, date, power reserve indicator
    * [[Nomos Epsilon]] Automatic
    * [[Nomos Zeta]] Automatic, date
    * [[Nomos Gamma]] Hand winding, power reserve indicator
    * [[Nomos Xi]] Automatic, GMT or world time
    * [[Nomos Alpha.2]] Hand winding, 2 hands


<WRAP ud ud_mov>

**Manufacturer:**
  * [[Nomos]]

**Description:**
  * [[Self-winding]] movement
  * [[Shock protection]]
  * [[Escapement]] stone lever
  * [[Yoke winding system]]

**Functions:**
  * [[Small seconds]]
  * [[Date display]]

**Data:**
  * 13½¾ [[ligne]]s
  * D 31 mm, H 4.3 mm
  * 26/24 [[jewels]]
  * 21,600 A/h
  * Bi-directional winding [[central rotor]] with Wippe
  * Power reserve About 42 hours

**Extras:**
  * Triovis [[precision adjustment]]
  * Glashütte [[solar grinding]] on ratchet and crown wheel
  * Glashütte [[three-quarter plate]]
  * Glashütter Gesperr

**Production period:**
  * Production [[2006]]-Present
  * Successor [[DUW 5101]]
</WRAP>

{{tag>Movements Automatic_movements Nomos_calibres}}