📍 Search by coordinates

Enter right ascension and declination to see the date that position transits around midnight (the best season to image it) and tonight's best observing time. Useful for dark nebulae not in the catalog or the center of your framing.

Name (optional)

Right ascension (RA) Unit for a numeric RA Declination (Dec)

Formats: RA 270.92 (degrees) / 18.06 (hours — choose "Hours" as the unit) / 18h03m41s / 18:03:41. Dec -24.38 / -24°22'49" / -24:22:49. An RA written as h/m/s is always read as hours, whatever unit is selected.

Observing site (Tokyo is filled in — change it if needed)

Latitude (north +) Longitude (east +) Time zone

Enter latitude and longitude, and choose the time zone of the observing site (your browser's time zone is added to the list).

Choose from locations saved in this browser.

Save the current lat/lon as a location

Get your current latitude and longitude from the browser.

Click the map or drag the pin (online only).

Try it

Click to look up these coordinates (location: Tokyo).

Link directly

Open a position directly from other tools or notes with a link like this. RA and Dec are in decimal degrees.

https://transit.wooder.info/object.php?ra=270.92&dec=-24.38&name=M8

Add &raunit=hour to pass RA in hours. Set the location with &lat=35.68&lon=139.77; if omitted, Tokyo is used. Add &lang=en for English.