Category Archives: Astronomy

Equinox and Epoch

Equinox and Epoch The word epoch denotes a particular point in time. In this sense the word has the same meaning in astronomy as it has in day-to-day life. For example, epoch J2000 means the time corresponding to the Julian … Continue reading

Posted in Astronomy | Tagged , , | 3 Comments

Refractive index of air and wave length conversion

Refractive index of air Contents Examples Converting wave length of light from vacuum to that in air Converting wave length of light from air to that in vacuum Refractive index Installation Details Comparison with IDLASTRO code The Python module ref_index … Continue reading

Posted in Astronomy, Python | Tagged , | Leave a comment

Line id plot

[Update 2012/04/22: Following suggestions from Jane Rigby (see comments below), I have created a couple of functions for changing properties of labels. These exists as separate code in the following Github Gist: https://gist.github.com/2326396 .] Manually placing labels in a plot, … Continue reading

Posted in Astronomy, Python | Tagged , | 13 Comments