Image: US Naval Observatory Master Clock
Size of this preview: 800 × 545 pixels. Other resolutions: 320 × 218 pixels | 3,361 × 2,290 pixels.
Original image (3,361 × 2,290 pixels, file size: 1.04 MB, MIME type: image/jpeg)
Description: US Naval Observatory Master Clock
Title: US Naval Observatory Master Clock
Credit: Own work
Author: Votpuske
Usage Terms: Creative Commons Attribution 4.0
License: CC BY 4.0
License Link: https://creativecommons.org/licenses/by/4.0
Attribution Required?: Yes
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