Nebraska Astronomy Applet Project ClassAction Project

Recent News

Eclipse Seasons Video

A new video has been uploaded on Eclipse Seasons. It is available on our YouTube Channel "UNL Astronomy" and embedded on the AU Demonstration Vidoes Page. It covers both the infrequency of eclipses and the reasons for this infrequency.

Wednesday, March 11, 2020  —  Kevin

Native Apps Update

New versions of executables for Windows and Macintosh OS are now available on the Downloads page. These include packages for NAAP simulations (now with background pages included), ClassAction, and the Interactive Ranking and Sorting Tasks. There will likely be one more update.

Thursday, January 30, 2020  —  Kevin

Flash Alternatives for ClassAction and NAAP

Flash will be removed from the web in 2020. Already web browsers are making it more difficult to use. We are pleased to announce that ClassAction and the NAAP labs are now available as native apps, for both macOS and Windows (they must be installed on your computer). These apps provide an offline alternative that does not require a browser plug-in.

Visit the downloads page at to get the ClassAction and NAAP Labs native apps. Download and run the appropriate files for your system and follow the prompts to install the apps. On Windows, the apps will appear under the AstroUNL folder in the Start Menu. On macOS, the ClassAction and NAAP Labs apps will appear in the Applications folder.

The ClassAction app is nearly identical to the online version. The NAAP Labs app is a work in progress. Currently it includes just the simulations and background interactives. We plan to include the background text so that the entire project will be self-contained. Between these two apps all simulations on the Simulations List Page are now available for use offline, without a browser.

Thursday, October 31, 2019  —  Kevin

Registration Open for Fall Workshop at UNL

A large workshop will be held for high school and college instructors of Physics and Astronomy at UNL on October 12, 2019. The workshop will be a joint meeting of the annual Astronomy Education Workshop and the fall biannual meeting of the Nebraska chapter of the American Association of Physics Teachers. Registration and continental breakfast begin at 8:30 am in Jorgensen Hall and the event will run until 4:30 pm.

Guests include:

  • Robert Hilborn (Associate Executive Officer of the AAPT) — who will be delivering a plenary on the nature of gravitational waves and teaching a longer session on implementing computation in physics classes. He will lead a breakout session on the Living Physics Portal -- a vast repository of teaching materials for IPLS (Introductory Physics for Life Science) students debuting soon.
  • Kathryn Williamson (Teaching Assistant Professor at West Virginia University) — who wil be delivering a plenary on incorporating networks of robotic telescopes in instruction and delivering a longer session on the Pulsar Search Collaboratory.

Attendees can choose between a large number of breakout sessions and three longer sessions. Continental Breakfast, Lunch, and parking are provided.

Registration is available at A flyer describing the event is available at

Attendees who are interested in leading one of the half-hour (interactive) breakout sessions should e-mail Kevin Lee at

Thursday, August 1, 2019  —  Kevin

New Demonstration Video

A new video entitled Eclipses 1: Shadows & Scale has been posted. It has both an embedded peer instruction question and an accompanying worksheet. The video is available on the Astronomy Demonstration Videos Home Page and on YouTube.

Tuesday, May 14, 2019  —  Kevin