I put together an earthquake page that shows heliplots from several seismometers around the United States. You can see both BHZ and LHZ heliplots. The BHZ heliplots are better at showing seismic events that are close to the seismometer, usually in the same or a nearby state. The LHZ heliplots are better at showing seismic events that happen far away from the seismometer, typically any large event that happens outside the United States.

These heliplots are provided by the Center for Earthquake Research and Information (CERI) and the United States Geological Survey (USGS). If you would like to see heliplots for other locations, you can choose a station from the USGS Advanced National Seismic System (ANSS), or you can choose a station from the USGS Global Seismographic Network (GSN). Also, you can visit CERI and choose a station from one of their station lists or their station map.

An analemma is a curve that shows off the apparent motion of a celestial object (usually the Sun) as seen from another celestial object (usually the Earth). The position of the moving object is captured at regular intervals, once per day or once per year, and if the motion is periodic, this will form a closed loop that will be the same from then on. You can read more about analemmas at the corresponding Wikipedia: Analemma page.

I wrote a python program back in February 2013 to calculate and plot the analemma of a few different solar system objects. You can visit my page here. There you can see some screenshots of my program and also download it if you'd like to run your own copy.