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Discover and read the best of Twitter Threads about #astronomy

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For the record, I know nothing about astrology.
I love Astronomy!!!
I was even on the core team during the repair the Hubble Telescope while the Cosmic Origins Spectrograph (COS) which was installed during Servicing Mission 4 (STS-125) in May 2009.
Astronomy (from Greek: ἀστρονομία) is a natural science that studies celestial objects & phenomena. It applies mathematics, physics, & chemistry, in an effort to explain the origin of those objects & phenomena & their evolution. I love looking at the stars.
Objects of interest include planets, moons, stars, galaxies, & comets; the phenomena include supernova explosions, gamma ray bursts, & cosmic microwave background radiation. More generally, all phenomena that originate outside Earth's atmosphere are w/in the purview of astronomy.
Read 49 tweets
THREAD - How about a bunch of blog posts on #Space and #Astronomy? Yes, I have more than you can imagine - especially since these are really just #physics topics. Hold on - because this is going to be a bit large.
2/ Here is an answer to my fav astronomy question EVER - "What would the phases of the moon look like if the moon was a cube?" wired.com/2015/09/moon-c…
3/ The great thing about the cube moon question is that it really tests if students understand phases of the moon rather than just recalling factual stuff. Here is my python model of a cube and spherical moon
Read 70 tweets
Expanding the #HertzsprungRussell diagram courtesy of @xkcdComic

#Physics #Astronomy #Cosmology

Step 1: Take an HR Diagram
Expanding the #HertzsprungRussell diagram courtesy of @xkcdComic

#Physics #Astronomy #Cosmology

Step 2: Add a Scale
Expanding the #HertzsprungRussell diagram courtesy of @xkcdComic

#Physics #Astronomy #Cosmology

Step 3: Expand the Diagram
Read 14 tweets
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Today's thread

Measurement of time.
How current calendars can't match ancient Hindu timekeeping.

Why a day isn't always 24 hours long

Why a year doesn't have 365.25 days

#science #astronomy #Time
1/n
How long does a day last everyday? 24 hours? Wrong.

We define day as the time taken by Earth to complete one rotation around its axis.
But with respect to what is the measurement made? 2/n
Since Earth is also revolving around Sun while it is rotating, it needs to rotate a little extra when rotation is measured w.r.t. sun (solar day) than a distant star (sidereal day)
3/n
Read 10 tweets
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