1. WebbPSF for WFIRST released!

    The extensions to WebbPSF that will allow it to compute PSFs for the wide field imaging instrument for the upcoming WFIRST mission have been released. Here are some resources for using them.

  2. Why does reading data from a file-like object "consume" it?

    Sometimes, one tries to iterate over some content more than once, and Python acts like it only iterated once. Here's the reason why, and some historical context for it.

  3. Recovering Signals from Unevenly Sampled Data

    Time-series data collected by astronomers typically has irregular gaps, usually because of ground conditions (like sunrise) getting in the way. The Lomb-Scargle algorithm allows observers to tease out periodicities in their data, even when it has gaps that would introduce noise in a Fourier transform-based approach.

  4. App Bundles with a Makefile

    Why is it a good idea to use tools from 1977 to build Mac apps? In this post, I build my SDL test app bundle using a Makefile instead of an IDE.

  5. SDL 2 on OS X Mavericks

    Setting up Xcode 5.1 for development with SDL 2, then getting a test program to compile and run

  6. Adaptive Optics in Plain English

    Explaining AO using the top one thousand most common words in English (inspired by xkcd)

  7. Boxcar smoothing with AstroPy

    Smooth a noisy signal by convolving it with a 'boxcar' kernel (or: the poor man's low-pass filter)

Background image of the Carina nebula by NASA, ESA, N. Smith (University of California, Berkeley), and The Hubble Heritage Team (STScI/AURA)