Star globe STAR GLOBE

• ‌Display / projection of stars and constellations on a sphere
  
• Precise representation without distortion
  

Very beautiful and rare star globe / celestial globe in wooden box for navigation on the high seas.

Alongside the sextant and the ship's chronometer, the star globe is an indispensable aid to navigation for shipping.

On the star globe, the starry sky with the constellations and fixed stars is depicted in mirror image on a sphere, so that an exact position can be determined over several scales with angular divisions.

The representation / projection of the stars and constellations on a sphere has the advantage that the starry sky can be depicted without distortion and true to nature. The sphere can be rotated according to the local hour angle and the world axis can be tilted according to the geographical latitude.

Two-dimensional images always result in distortions; precise visualisation and positioning in a flat form is not possible.

Why use a star globe or star finder?

Star globes or star finders are suitable for the alternating conversion of celestial to horizontal coordinates of the stars.

Question:

Where is this or that star at my current position? The celestial coordinates: Local hour angle and declination from the nautical yearbook are set accordingly on the star globe or finder. The horizontal coordinates are now read at the location of the star found in this way: Azimuth, i.e. direction, and altitude. Conversely, the altitude and direction can be used to deduce the celestial coordinates and thus the name of the unknown star. This facilitates astronavigation with the sextant:

For example, you can observe an unknown star between wispy clouds. The sextant altitude and approximate direction are determined. Now it is possible to find celestial coordinates and star names to calculate the line of sight.

Venus, which is invisible to the naked eye in the daytime sky, should be located with the sextant. Star globes or finders are used to determine altitude and direction. Venus can now be located using the sextant optics.

The use of navigation computers, which often have corresponding functions, is also particularly convenient.

Scope of delivery:

• STAR GLOBE
  
• Wooden case