I wanted a quick way to browse different days. I added ‘PREV SOL’ and ‘NEXT SOL’ chevron buttons and set the date boundary rules—you can’t step earlier than NASA’s first post (June 16, 1995) or past today’s date. I also hooked up browser keydown listeners so you can page through days using the Left and Right Arrow keys. After that, I built an ‘Auto-Scan’ mode that cycles random space pictures every 15 seconds. If you manually select a date, the scanner pauses so it doesn’t interrupt your reading.