Moon with Hexagrams in a German Cathedral

What is the meaning of these Hexagrams in the Cathedral of Cologne, Germany?

Picture is courtesy of  Marco Braun from Flickr.

1928 Maccabiah Certificate

Magen David appears on top of this 1928 Maccabiah certificate, which shows that Eliyahu Catz won the first place.

Copyright: Rony Dror 2008 Maccabi Archive, Kfar Hamaccabiah

Thanks to Dobush from Kfar Aza for referring me to this unique document.

Rosy Cross Hexagrams

Hexagrams appear on the top corners of this illustration, which is titled:

"The Temple of the Rosy Cross". From: Teophilus Schweighardt Constantiens, 1618

Copied from Wikimedia entery Image:Templeofrosycross.png  uploaded by Campani  

Hexagram with Planet Glyphs

The six glyphs of the planets surround the Sun; each glyph occupies another triangle of a hexagram. Picture is from Opus Medico-Chymicum, an alchemy book by Johann Daniel Mylius published in 1618. The usage of the six-pointed star to represent the planets is a new discovery for me, and I’ll appreciate it if readers could refer me to articles about this subject, or to other pictures that show this kind of usage.

I reckon that the planets in this illustration represent the days of the week, while the zodiac signs represent the months:

1. Sun Day
2. Moon Day
3. Mars day
4. Mercuri day
5. Jupiter's day
6. Venus Day
7. Saturn day

Copyright: “abramelin” from Flickr 2008

Hexagrams Represent Planets-1

The five colorful alchemical hexagrams represent the planets (not including the yellowish Sun and the silvery Moon)

Picture is from Wikipedia entry: “Odd people” uploaded by Mattes 

Source: Basilius Valentinus, Azoth ou le moyen de faire l'Or caché des Philosophes, Paris, 1659.

It seems that using hexagrams to represent the planets was a conventional theme for the 17^th century illustrators of alchemical books. 

Alchemy - Hexagrams Represent Planets-1

The five hexagrams on top of this illustration represent the planets (not including the Sun and the Moon)

Picture is from Spanish Wikipedia entry: Nigredo

Source: Basilius Valentinus, Azoth ou le moyen de faire l'Or caché des Philosophes, Paris 1659.

Pencils

Magen David made from pencils on the 1985 postcard of the Graphic Designers of Israel 50^th Anniversary. Design: Maurice Arbel. The item is from Hayim Shtayer’s collection. Courtesy of Hayim Shtayer