Here are some posts for you.

• If the moon was a cube, what would the phases of the moon look like? – wait! I even model a cubical moon phase with python.  It’s awesome.
• How to find your location on the surface of the Earth with a watch and a protractor (from MacGyver).
• I hate the term “super moon” – the moon is already awesome.
• Could the interstellar asteroid (Oumuamua) be a spacecraft?  
• Estimating how many people in the USA could watch the total solar eclipse.
• Does a solar eclipse change the Earth’s temperature?  An estimation problem.
• LIGO isn’t a gravitational wave detector – it’s an observatory. How do you use two detectors to pinpoint the location of a gravitational event.
• What is a leap second and why do we use it?
• Why is it so difficult to see Pluto?  Why is New Horizons so much better than the Hubble Space Telescope?
• What’s so special about the Vernal Equinox?  A short story in the style of Dr. Seuss.
• How do we know the Earth orbits the Sun and not the other way around?
• Comets don’t “zoom” across the sky – and other answers to questions about comet ISON.
• Parallax is important in astronomy – you can see an example in the iPhone iOS wallpaper.
• How do you find the average density of a planet like Saturn?
• No, Saturn wouldn’t “float in water” – that’s just silly, here’s why.
• The physics of why a comet has two tails.
• Does the moon orbit the Sun or the Earth?
• Why doesn’t the moon crash (fall) into the Earth?
• What is Daylight Saving Time? 
• How did humans use the transit of Venus to find the distance (and size) of the Sun?
• A super nova is so bright you can see it happen in a different galaxy.
• Estimating the radius of the Earth using a big lake.
• Why is there so much carbon in the universe?  Nuclear fusion and the Hoyle State.
• The moon has the same side facing the Earth – but we can see more than half the moon – here’s how.
• Speaking of the moon – here is an epic old model of the moon and it tells us something about the nature of science.
• Explaining the Earth’s ocean tides is pretty tough, but here is my attempt.  Yes, you can explain that.
• Modeling the debris field for a broken meteor in the Earth’s atmosphere.
• xkcd had a great comic on gravity wells – here is my explanation.
• Explanation of some of the cool things the Greeks did in astronomy: size of the Earth, size of the moon, size of the Sun.
• What causes the seasons?
• When is the sun directly overhead?
• My interview with Neil deGrasse Tyson about video games and space stuff.
• Yes, there IS gravity in space – a look at a space scene from the show The 100.
• Why do astronauts “float” in space?  All about gravity and “weightlessness”.
• Why are planets spherical but asteroids are not (an example from Guardians of the Galaxy Vol. 2) – python stuff included.
• How to calculate the universal gravitational constant (G) with a pendulum and a mountain.
• Saturn’s rings have gaps – here’s how to model ring gaps with python.
• Crashing into the Sun isn’t very easy – here’s why.  Python included.
• The only way to solve the “three body problem” is with a numerical calculation – here’s how to do it with python.
• 6 things you probably didn’t know about gravitational waves.
• Calculating the speed of light using the moons of Jupiter.
• If we lived on Mars, how would we play American Football?
• Modeling humans running on the moon.
• What are Lagrange Points in orbits?
• What’s so special about Low Earth Orbit?
• Physics homework questions for the New Horizons Pluto mission.
• Using images from New Horizons to calculate the mass of Pluto.
• Python tutorial – gravity and orbits.
• Could a human walk on the surface of a comet?
• Explaining the tides in 10 seconds (not really).
• Cool things about gravity on Gravity Day.
• Why is a comet’s tail curved?
• How fast would the Earth have to spin to fling people off?
• Video analysis of the acceleration of moon dust from the Apollo mission.
• xkcd’s interplanetary cessna.
• How much energy does it take to get candy into orbit at the ISS.
• How long would it take to fall through a hole that goes through the center of the Earth?
• Gravitational weight in Jules Verne’s “From Earth to the Moon”
• Would it be better to launch a spacecraft from the equator or a mountain?
• If you rode on the ESA space craft Rosetta, could you jump onto a comet as it moved past it? (ESA blog post).
• How many trips would the ESA ATV need to supply the Death Star? (ESA blog post).
• Measuring the acceleration during an ATV reboost for the ISS (ESA blog post).
• Physics of the Mars Helicopter.
• Three ways to make a rocket with a bottle.  Bottle rockets.
• Nuclear rockets vs. ion rockets.  Is it better to have one big shot or a bunch of tiny ones?
• The difference between visible light and infrared light.
• Three observations you can make to support a heliocentric model of the solar system.
• An explanation of the Astronomical Unit, the Parsec, and the Light-year.
• Video analysis of the lunar ascent from Apollo 17
• Newton’s cannonball considers the motion of a ball fired from a tall mountain.  I have reproduced this with python.