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The file desitarget/data/targetmask.yaml contains the following:
#- Observing conditions
#- These are a bitmask to allow target bits to specify multiple conditions
#- in which they are allowed to be observed.
#- See DESI-0311 and DESI-0333 for discussion of DARK vs. GRAY
obsconditions:
- [DARK, 0, "Moon is down"]
- [GRAY, 1, "Moon up; illum fraction<0.6 and (illum*elev)<30 deg"]
- [BRIGHT, 2, "Moon up and bright (not GRAY)"]
- [POOR, 3, "Very bad seeing, high extinction, or bright cloud cover"]
- [TWILIGHT12, 4, "Between sunset/sunrise and 12 degree twilight"]
- [TWILIGHT18, 5, "Between 12 and 18 degree twilight"]
- [DAY, 6, "Daytime calibrations"]
- [CLOSED, 7, "Nighttime but dome is closed due to rain, wind, dew..."]
- [APOCALYPSE, 8, "Conditions are so bad that the world is ending anyway"]
We are currently using 13deg and 15deg twilight in the afternoon planner (desisurvey.afternoonplan), so this issue is to review the twilight defns, and get everything in synch.
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