MMT Observer's Almanac
- Current Year Almanac (ASCII) (PDF)
- Past Almanacs
Time
- International Earth Rotation Service -- hosted by USNO
- Recent and predicted values for UT1-UTC
- Discussion of and values for time parameters
Weather
- Current Conditions -- Mt. Hopkins summit
- Current Conditions Graphs -- Mt. Hopkins summit
- Weather Imagery -- great images of Southern Arizona conditions.
- National Environmental Satellite, Data, and Information Service
- National Weather Service -- Tucson Forecast Page
- National Weather Service -- Tucson
- Southeast Arizona Forecast Discussion
- Raw Data from the NOAA station on Mt. Hopkins
- Mt. Hopkins Clear Sky Forecast (experimental)
- FLWO Weather Station
- Wind Rose Diagram (Current Average Wind)
- Wind Rose Diagram (Current Max Wind Gust)
Other
- Sky & Telescope's This Week's Sky at a Glance