Compass Rose Mosaic

Compass Rose Mosaic

TITLE: Compass Rose with Glass mosaic

MEDIUM: 11 gauge steel cut with an acetylene torch

SIZE: Approximately 18" tall x 18" wide

Seasoned steel compass with glass and clay mosaic design

compass rose, sometimes called a windrose or Rose of the Winds, is a figure on a compass, map, nautical chart, or monument used to display the orientation of the cardinal directions (north, east, south, and west) and their intermediate points. It is also the term for the graduated markings found on the traditional magnetic compass. Today, the idea of a compass rose is found on, or featured in, almost all navigation systems, including nautical charts, non-directional beacons (NDB), VHF omnidirectional range (VOR) systems, global-positioning systems (GPS), and similar equipment.

 
Compass rose with the eight principal winds

The modern compass rose has eight principal winds. Listed clockwise, these are:

Compass pointAbbr.HeadingTraditional wind
NorthNTramontane
North-EastNE45° (45°×1)Greco or Grecale
EastE90° (45°×2)Levante
South-EastSE135° (45°×3)Sirocco
SouthS180° (45°×4)Ostro or Mezzogiorno
South-WestSW225° (45°×5)Libeccio or Garbino
WestW270° (45°×6)Ponente
North-WestNW315° (45°×7)Maestro or Mistral

Although modern compasses use the names of the eight principal directions (N, NE, E, SE, etc.), older compasses use the traditional Italianate wind names of Medieval origin (Tramontana, Greco, Levante, etc.)

4-point compass roses use only the four “basic winds” or “cardinal directions” (North, East, South, West), with angles of difference at 90°.

8-point compass roses use the eight principal winds—that is, the four cardinal directions (N, E, S, W) plus the four “intercardinal” or “ordinal directions” (NE, SE, SW, NW), at angles of difference of 45°.

16-point compass roses are constructed by bisecting the angles of the principal winds to come up with intermediate compass points, known as half-winds, at angles of difference of 22​12°. The names of the half-winds are simply combinations of the principal winds to either side, principal then ordinal. E.g. North-northeast (NNE), East-northeast (ENE), etc.

32-point compass roses are constructed by bisecting these angles, and coming up with quarter-winds at 11​14° angles of difference. Quarter-wind names are constructed with the names “X by Y”, which can be read as “one quarter wind from X toward Y”, where X is one of the eight principal winds and Y is one of the two adjacent cardinal directions. For example, North-by-east (NbE) is one quarter wind from North towards East, Northeast-by-north (NEbN) is one quarter wind from Northeast toward North. Naming all 32 points on the rose is called “boxing the compass”.

The 32-point rose has the uncomfortable number of 11​14° between points, but is easily found by halving divisions and may have been easier for those not using a 360° circle. Using gradians, of which there are 400 in a circle,[1] the sixteen-point rose will have twenty-five gradians per point.

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