Die Sonne als Künstlerin
Dieses Bild der Woche zeigt den Pfad der Sonne am Himmel, vom Standort des Paranal-Observatoriums der ESO in Chile aus gesehen. Das Bild wurde mit einer Lochkamera mit einer Belichtungszeit von 8 Monaten aufgenommen: vom 17. April bis zum 11. Dezember 2018. Die hohe Struktur im Vordergrund ist der „Seeing-Monitor“, der die Unschärfe bzw. das Funkeln der Sterne aufgrund der atmosphärischen Turbulenzen misst. Im Hintergrund sind mehrere Kuppeln zu sehen; die Kuppeln in der Mitte links sind Teil des Very Large Telescope, und die ganz rechts gehört zum VLT Survey Telescope.
Aber was sind die hellen farbigen Linien dahinter? Sie werden von der Sonne erzeugt, die sich im Laufe des Tages über den Himmel bewegt und eine Spur auf dem Fotopapier in der Lochkamera hinterlässt.
Die Kamera war nach Westen ausgerichtet, daher sehen wir hier Hunderte von Sonnenuntergängen. Aber da sich die Erde um die Sonne bewegt, geht die Sonne jeden Tag an einem anderen Punkt am Horizont unter. Der kürzeste Bogen ganz rechts im Bild entspricht der Wintersonnenwende (21. Juni in der südlichen Hemisphäre), wenn die Sonne ihren niedrigsten Stand erreicht. Von diesem Zeitpunkt an bewegt sich die Sonne Tag für Tag nach Süden, in diesem Bild nach links. Die Bögen werden länger und höher, und die Tage werden länger und heißer. Dann, zur Sommersonnenwende (21. Dezember), erreicht die Sonne ihren höchsten Punkt, der in diesem Bild nicht sichtbar ist, und zieht den längsten Bogen nach links.
Die dunklen Linien sind auf Wolken zurückzuführen, die die Sonne abdunkeln. Zum Glück für die Astronom*innen hat das Paranal-Observatorium mehr als 300 klare Tage im Jahr, daher die wenigen dunklen Streifen in diesem Bild.
Bildnachweis:D. López Calvin (solarigrafia.com), J. C. Muñoz Mateos / ESO. License: CC-BY-NC 4.0
Über das Bild
| ID: | potw2311a |
| Sprache: | de-be |
| Typ: | Fotografisch |
| Veröffentlichungsdatum: | 13. März 2023 06:00 |
| Größe: | 1024 x 1024 px |
Über das Objekt
| Name: | Sun |
| Typ: | Unspecified : Sky Phenomenon |
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