The most mundane explanation: The user intended something else.
(e.g., watching a marathon from the 18th to the 31st of a month) fu10 day watching 18 31
Guide for a 10-day watch event:
If "FU10" is a telescope, satellite, or experiment code (e.g., Fermi Observatory Unit 10), then "day watching 18 31" could refer to Right Ascension 18h and Declination +31° (a point in the constellation Hercules). Astronomers often log "day watching" for continuous monitoring. The most mundane explanation: The user intended something
Example: On March 18, 2031 (18/3/31), the FU10 instrument will perform a deep-field survey. If "FU10" is a telescope, satellite, or experiment code (e