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21 Aug, 2019
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File:Iotw2235a - Star Sweeps.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:32, 22 June 2023		7,200 × 4,800 (15.51 MB)	C messier	full size
	14:44, 26 December 2022		1,280 × 853 (405 KB)	Pandreve	Uploaded a work by CTIO/NOIRLab/NSF/AURA/B. Tafreshi from https://noirlab.edu/public/images/iotw2235a/ with UploadWizard

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Cerro Tololo Inter-American Observatory

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Credit/Provider	CTIO/NOIRLab/NSF/AURA/B. Tafreshi
Source	NSF's NOIRLab
Short title	Star Sweeps
Image title	The sky over Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab, is here densely packed with a brilliant array of curving lines, looking a little like a well-lit wheel that has been sent spinning. In fact, this light streak effect is indeed due to something spinning — Earth! The photographer has used a very long exposure to capture this image, sonot only is CTIO visible in sharp detail, but the rotation of Earth on its own axis can be “seen” in the movement of the stars. The center of the circular effect, where the star streaks seem to be rippling out from a point in the upper left of the image, indicates the Earth’s southern geographic pole, i.e., the southern end of the Earth’s axis of rotation.
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	12:00, 31 August 2022
JPEG file comment	The sky over Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab, is here densely packed with a brilliant array of curving lines, looking a little like a well-lit wheel that has been sent spinning. In fact, this light streak effect is indeed due to something spinning — Earth! The photographer has used a very long exposure to capture this image, so not only is CTIO visible in sharp detail, but the rotation of Earth on its own axis can be “seen” in the movement of the stars. The center of the circular effect, where the star streaks seem to be rippling out from a point in the upper left of the image, indicates the Earth’s southern geographic pole, i.e., the southern end of the Earth’s axis of rotation.
Software used	Adobe Photoshop 23.0 (Windows)
File change date and time	00:38, 6 December 2021
Date and time of digitizing	13:21, 6 April 2021
Date metadata was last modified	01:38, 6 December 2021
Unique ID of original document	xmp.did:d2abceaa-e40b-4cd7-991d-d4150490db0f
Keywords	Cerro Tololo Inter-American Observatory
Contact information	https://noirlab.edu 950 North Cherry Ave. Tucson, AZ, 85719 USA
IIM version	4

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