Naturalist companion
Daylight & seasons
A quiet map of night, twilight, and day for your place, plus a US seasonal field calendar for journaling. The seasonal chart lists creatures named in the Naturalist’s Field Journal: mammals and tracks, backyard insects and pollinators, under-log life, cricket evenings, and trees through the seasons. Cross-check sky cover on Clouds now and the lunar cycle on Moon phases.
No location set. Search a city, use your location, or enter coordinates.
Location is shared with Clouds now and Moon phases when set, and stays in this browser only. Times are approximate local clock times for journaling, not navigation.
Set a location to compute sunrise, twilight, day length, and a seasonal field chart for your latitude.
Daylight & twilight
Night, twilight, and daylight across 24 hours of local time.
- Night
- Nautical twilight
- Civil twilight
- Daylight
| Civil dawn | … |
|---|---|
| Sunrise | … |
| Solar noon | … |
| Sunset | … |
| Civil dusk | … |
| Nautical dawn | … |
| Nautical dusk | … |
| Day length | … |
| Note | … |
US seasonal field calendar
The month-by-month field calendar is written for the United States (approximate USDA hardiness zone and multi-state region). Daylight and twilight above still apply worldwide. For journaling outside the US, use the day map and your own local knowledge.
| US region | … |
|---|---|
| USDA hardiness zone (approx.) | … |
| Meteorological season | … |
| Astronomical season | … |
Findable now
| What | Kind | Why now / where to look | Likelihood |
|---|
Nearby months
Not an exact-pin species list. Editorial rows from a static regional calendar aligned with the Naturalist’s Field Journal (mammals, insects, trees). Elevation, coast, city light, and land use change what you meet. Trust your eyes and write what is actually there.
Sunrise and sunset use a mean solar position (equation of time and declination in the spirit of Jean Meeus / NOAA approximations), then horizon crossings at about −0.833° for rise and set, −6° for civil twilight, and −12° for nautical twilight. Expect times within a few minutes of precise ephemerides on most mid-latitude days. Polar day and night, and days when twilight never fully ends, are flagged in the note row.
The field calendar maps your coordinates to a coarse US multi-state region and an approximate USDA hardiness zone (a temperature-based garden zone, not a claim about what grows at your pin). The month chart is a small static editorial set for journaling: structured rows for mammals, insects, small creatures, and tree cues named in the Naturalist’s Field Journal (birds and wildflowers appear only lightly). Alaska and Hawaii are noted simply; elevation and microclimates are not modeled. Outside the US, daylight still computes; the calendar stays US-focused.
Meteorological seasons use common calendar-month quarters for the Northern Hemisphere. Astronomical seasons follow approximate equinox and solstice dates.