A #cosmicdistanceLadder post on the many ways we project our planet onto a plane. No projection can faithfully reproduce *all* the geometric features of a sphere, so each projection is a compromise; but some projections are still preferred for specific applications. www.instagram.com/p/DVC9SvxkXDs
First page of the instagram post
A new #CosmicDistanceLadder post to mark the summer solstice, on how astronomical measurements, from the time of Eratosthenes to the modern day, rely on the tireless (and often unsung) efforts of many careful and precise data collectors. www.instagram.com/p/DLG6a_WIWyb
The first page of the instagram post on how we measure cosmological durations.
A new #CosmicDistanceLadder post on how the distance ladder can also be used to measure cosmic durations, as well as cosmic distances. www.instagram.com/p/DJ2ra2soG4j
A new #CosmicDistanceLadder post, on intriguing hints from the DESI survey data that suggests that the cosmological constant (aka "dark energy) might not, in fact, be constant after all. www.instagram.com/p/DIP0yy5oDUu
First page of the instagram post
A new #CosmicDistanceLadder post on why lunar and solar eclipses tend to come in pairs (for instance, the solar eclipse next week is paired with the lunar eclipse from last week). www.instagram.com/p/DHkS3EcA40L
First page of the instagram post
A new #CosmicDistanceLadder post, on how the recent lunar eclipse from the vantage point of the Earth becomes a solar eclipse from the vantage point of the Moon: www.instagram.com/p/DHR1tuWonDR/
A new post on my #CosmicDistanceLadder Instagram with Tanya Klowden on the parallels (but also differences) between ancient Greek and ancient Indian astronomy. www.instagram.com/p/DGzJs02AbBA
Part 2 is now live on YouTube 🎉:
“How To Measure The Universe: The Cosmic Distance Ladder Part 2”, 3Blue1Brown (youtu.be/hFMaT9oRbs4).
#Astronomy #Math #CosmicDistanceLadder #Video #Physics #Cosmos #Universe
A red sky in Los Angeles last week.
A brief update on my #CosmicDistanceLadder instagram with Tanya on the fires that have affected (one of our) home cities. (But the sky is much, much bluer today.) www.instagram.com/p/DEyx7o_OFLz
Captain Cook's Endeavour makes landfall to observe the transit of Venus in the southern hemisphere.
A #CosmicDistanceLadder on how Christmas in Australia is inverted in many ways from Christmas in the Northern hemisphere, and how the parallax differences were once important in climbing that distance ladder. www.instagram.com/p/DEExnvvRkCQ
A “Clonehenge” or replica of Stonehenge at the winter solstice on display at the Deutsches Museum in Munich, Germany.
A new
#CosmicDistanceLadder
post on the winter/summer solstice in the Northern/Southern hemisphere yesterday: www.instagram.com/p/DD1c47nIKJ2 (One can also refer to this solstice as the Southern solstice - the time of year when the Sun is at its southernmost, regardless where one is on the Earth.)
