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I just realized while I was replying to you Pink Floyd was playing in the background. My blob looks like there was some thin cirrus obscuring it, but I think it was perfectly clear.

One of the brightest auroral features I have seen was this blob on 5/11/24, due east. I took this with my iPhone as I was using my other camera to create a time lapse and it was pointed north. I kept thinking that a train was approaching as it slowly grew in brightness.

Did you see orange with your eye? I kept doubting myself!

I was stunned by the brightness at my 39 N latitude Northern California location. I was fortunate to be outside during the most intense part when orange appeared inside the red. I watched my camera click away and was tempted to adjust the settings because it looked over-saturated! #astrophotography

Einstein had this attitude about an esoteric college math class. Later when working on General Relativity he realized he needed to know THAT kind of math. He found it difficult to learn on his own. David Hilbert almost beat him in the race to develop General Relativity. #ITeachPhysics

That is the Torque Feeler lab in the Conceptual Physics Lab Manual. I used a 0.5 kg mass instead of the specified 1 kg. 1 kg hurts! "Feel the torque, Luke" #ITeachPhysics

Most people can only see 5-6 Pleiades. Those that can see more, usually see more than 7. So why are they called the Seven Sisters? The answer may be the world’s oldest story: theconversation.com/the-worlds-o...

Timing is everything because the brightness can vary by orders of magnitude. I was lucky this time and saw 2 of the 3 bright outbursts.

I had a student do an internship at a hospital where they used accelerometer data to detect when a person might be ready to fall and issued a warning. We had used and studied accelerometers in class and they were struck by how they could be used to help seniors who are prone to injury from falls.

We had a red and green lake at line 39 N in Northern California on 11/11. #astrophotography

Great image. Hard to believe the Squid was only recently discovered in 2011 by an amateur, until you try and image it!

I wrote this Smart Cart sense and control activity: www.pasco.com/resources/la... My favorite was a Red Light/Green Light program. It was a little over the top because I had access to all the PASCO equipment. It has a Smart Cart with a motor, light sensor, and wireless light source. #ITeachPhysics

PASCO has Blockly coding built in to its sensor software SparkVUE and Capstone. It lets students build control routines using sensor input. I had great fun with this when I worked there. It is highly engaging and a good intro to sense and control: www.pasco.com/products/gui...

Great list. The free iPhone app Constellation Map Mobile is useful for polar alignment in the daytime. Put in search South Celestial Pole mode, place the phone on the mount's north side. Adjust the Az and El until the phone is pointed down at the SCP. apps.apple.com/us/app/const... #astrophotography

And Fire Lake! youtu.be/rRhHemn6Xhc?...

Are you sure about this?

I was able to upgrade my room for an extra 3$/night for a High Roller view room. I took this time-lapse from our room at the Westin 8 years ago. It takes 30 min to rotate in real time. With a diameter of 158 m, what is the centripetal acceleration of a passenger? #ITeachPhysics