Glossarbegriffe: Himmelskoordinaten
Description: Von der Erde aus nehmen wir Himmelsobjekte so wahr, als befänden sie sich auf einer Kugel, die üblicherweise Himmelskugel genannt wird. Wir können jede Position auf dieser Sphäre mit zwei Zahlen beschreiben. Jede Methode, um zwei solcher Zahlen einer Position am Himmel zuzuordnen, wird als Himmelskoordinatensystem bezeichnet. Die zwei Zahlen werden als die (Himmels-)Koordinaten des Objekts bezeichnet.
Auf der Erdoberfläche verwenden wir für den gleichen Zweck die geografische Breite und Länge. Daraus leitet sich auch eine Methode zur Definition von Himmelskoordinaten ab: Die Punkte am Himmel, die sich direkt über dem Äquator der Erde befinden, bilden den Himmelsäquator. Einem Punkt, der sich direkt über einem bestimmten Ort auf der Erdkugel befindet, werden Zahlen zugeordnet, die der geografischen Breite/Länge des Punkts auf der Erdoberfläche entsprechen.
Astronomen verwenden verschiedene Arten von Koordinatensystemen. Darunter ist auch ein System, das die tägliche Rotation der Erde berücksichtigt, sodass die Koordinaten universell sind und überall auf der Erde verwendet werden können. Dadurch wird auch sichergestellt, dass sich die Koordinaten z. B. eines Sterns über Zeiträume von Tagen, Monaten oder Jahren nicht wesentlich ändern.
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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