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Differential photometry for humans (and astronomers)

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There's now a limit of 10,000 credits, and we easily exceed it. https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing ![image](https://user-images.githubusercontent.com/1575425/123865152-dc6ec480-d92b-11eb-924f-83e7322b5aab.png)

important

Python 2 reached its EOL on January 1st, 2020. > [...] no new bug reports, fixes, or changes will be made to Python 2, and Python 2 is no longer...

important

Bumps [py](https://github.com/pytest-dev/py) from 1.9.0 to 1.10.0. Changelog Sourced from py's changelog. 1.10.0 (2020-12-12) Fix a regular expression DoS vulnerability in the py.path.svnwc SVN blame functionality (CVE-2020-29651) Update vendored apipkg: 1.4...

dependencies

We subtract the magnitude of the comparison star from that of the star, not the other way around, see: https://github.com/vterron/lemon/blob/0a33c725bf2f229d9ae9e3f9de50bfb2141a3fba/diffphot.py#L468

Since September 29 I'm no longer affiliated with the [Institute of Astrophysics of Andalusia](https://www.iaa.csic.es/en) (CSIC). For posterity: ![image](https://user-images.githubusercontent.com/1575425/94726571-b77a0080-035d-11eb-81f3-2237ff8d072d.png)

important

This is the `BJD_TDB` FITS keyword. It's a non-standard keyword but commonly used for exoplanets. More information on: - https://en.wikipedia.org/wiki/Barycentric_Julian_Date - http://astroutils.astronomy.ohio-state.edu/time/

enhancement
important

There is some kind of error when displaying the (x,y) coordinates in the bottom right corner of lemon juicer's plots. The problems are: -The x coordinate (time) shows wrong times...

bug
important

How hard could it be to remove IRAF by substituting it by photutils http://photutils.readthedocs.org/en/latest/photutils/aperture.html This would make the install process a lot more easier.

enhancement
important

Hello, In juicer, would it be possible for double-clicking on a data point in the lower right frame to bring up the image that data point is taken from? This...

important

The command `diffphot` should warn the users when there are too many astronomical objects whose light curve could not be generated because of an insufficient number of images or comparison...

enhancement
important