2024-02-20: updated light pollution data to 2022 values
2024-02-19: added an option to input multiple objects directly, in addition to via file upload
2024-02-18: added Italian version by combining machine translation with very basic knowledge of the language. Reports of errors are welcomed!
2024-02-14: replaced previous generic observatory locations at La Palma, La Silla, Paranal and Mauna Kea with locations of specific telescopes. See observatories list for details
2022-11-10: airmass.org is now also available in Greek. Many thanks to Panagiotis Evangelopoulos of the Institute of Astrophyics at FORTH for the translation!
2021-08-30: a text file containing a list of objects to be plotted can be uploaded, under "advanced options"
2021-08-14: added facility to find nice targets that are observable from the selected observatory and date
2021-08-07: the starting month of annual plots can be changed
2021-07-25: added a sky view chart
2021-07-21: added option to plot the number of hours an object spends above a given altitude, during astronomical night, sunless hours or 24-hour periods
2021-07-05: new URL, half the number of syllables: airmass.org! Old URLs should redirect seamlessly to the new site until the old domain expires.
2021-07-01: deep-sky object names can be edited
2021-06-29: upper and lower pointing limits can be displayed on daily chart