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physicsJ's profile
Dr. James O'Donoghue
Dr. James O'Donoghue
Dr. James O'Donoghue
@physicsJ

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Dr. James O'Donoghue

@physicsJ

Planetary Scientist @NASAGoddard. Researching: #Saturn #Rings #Aurora #Jupiter #GreatRedSpot #Atmospheres From UK, in US, Japan 2019. Tweets/animations my own.

Maryland, USA
jamesodonoghue.wixsite.com/home
Joined December 2010

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    Dr. James O'Donoghue‏ @physicsJ 28 Dec 2018

    So i spent the holidays making this animation. Shown are the exact rotation periods & axial tilts of the eight largest planets in our solar system. (NASA imagery was used) . #planets #solarsystem #mercuryvenusearthmarsjupiteruranusneptune #spacepic.twitter.com/VDE3xNrpCI

    8:09 pm - 28 Dec 2018
    • 11,158 Retweets
    • 29,536 Likes
    • C. Lucas Conner Inge Focht Estelle Lambert Yalquzaq P a t r i c i a🦋 Mohammad Nuruzzama Cy Thu Hien MAI
    589 replies . 11,158 retweets 29,536 likes
      1. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018

        Dr. James O'Donoghue Retweeted Dr. James O'Donoghue

        Corrected, faster & longer version:https://twitter.com/physicsJ/status/1079061451845890048?s=19 …

        Dr. James O'Donoghue added,

        0:40
        Dr. James O'Donoghue @physicsJ
        *NEW* Final version: FASTER, longer, and corrected thanks to Twitter! 👍 Day length (sidereal) & axial tilt for the 8 largest planets in our solar system! Which planet best represents you? 🧐 HD Download for educators etc: https://tinyurl.com/y85u2ev7  #SolarSystem #SciComm pic.twitter.com/RPD8aRpUzr
        Show this thread
        40 replies . 592 retweets 1,408 likes
        Show this thread
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      1. New conversation
      2. Nathan Nahrung‏ @NatoNine 29 Dec 2018
        Replying to @physicsJ

        So close... You used sidereal days instead of solar days in all but one case, Venus. Although, precision could also be improved for Mars and Neptune. https://en.wikipedia.org/wiki/Rotation_period … #WhyHashtagEveryPlanetExceptSaturn

        5 replies . 3 retweets 84 likes
      3. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018
        Replying to @NatoNine

        Oh my goodness. I will rerender with that correction. Good spot!

        2 replies . 1 retweet 122 likes
      4. majmaj‏ @drMajMaj 29 Dec 2018
        Replying to @physicsJ @NatoNine

        This exchange is a beauty to behold. Civilization is getting better with each conversation like this. Thank you! #Science . #planets #SolarSystem #mercuryvenusearthmarsjupiteruranusneptune #Spacepic.twitter.com/WsQbjFyxUE

        4 replies . 13 retweets 139 likes
      5. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018
        Replying to @drMajMaj @NatoNine

        It's true, this is how we do science!

        2 replies . 1 retweet 105 likes
      6. Daniel A. Córdova C.‏ @huiragchuro 29 Dec 2018
        Replying to @physicsJ @drMajMaj @NatoNine

        if only politicians could do the same. impressive, great job. thank you.

        0 replies . 0 retweets 59 likes
      7. End of conversation
      1. New conversation
      2. Zaid Marham‏ @zaidmarham 31 Dec 2018
        Replying to @physicsJ

        This is superb. I had no idea Mercury and Venus had such tiny axial tilts. Just out of interest, by 1d do you mean 24h or do you mean 23h 56min?

        2 replies . 0 retweets 0 likes
      3. Dr. James O'Donoghue‏ @physicsJ Jan 1
        Replying to @zaidmarham

        1d is the SI unit 24hours. I'll put a legend in future figs. Cheers

        1 reply . 1 retweet 1 like
      4. Zaid Marham‏ @zaidmarham Jan 1
        Replying to @physicsJ

        There's no need to trouble yourself. I was just struck by how similar both quantities are for Earth and Mars. I can see the axial tilt differs by just a couple of degrees but I just wanted to check if the rotation period differs by 36 or 40 minutes. Nice work anyway.

        1 reply . 0 retweets 1 like
      5. Dr. James O'Donoghue‏ @physicsJ Jan 1
        Replying to @zaidmarham

        Thanks! Yeah it came up a few times about the 1d thing. It's basically that 23h 56m is a sidereal day and 24hr is d (the solar day). Re: Venus, it is 177.3 or 2.7 deg tilt: the former is more properly called Obliquity to Orbit, the latter is Inclination of Equator (by NASA) 1/2

        1 reply . 2 retweets 1 like
      6. Dr. James O'Donoghue‏ @physicsJ Jan 1
        Replying to @physicsJ @zaidmarham

        Axial tilt can be either, as best as I can see: it's simply the absolute angle between rotation axis and the orbit plane. Almost all of the time Venus is quoted as 177.3 deg in textbooks etc, but actually it looks like NASA are moving to say 2.7 these days. 2/2

        0 replies . 2 retweets 1 like
      7. End of conversation
      1. New conversation
      2. John Huth‏ @JohnHuth1 29 Dec 2018
        Replying to @physicsJ @DawnSunrise1

        Minor nit pick - Earth's axis is 23.45 degrees - but other than that - great graphic - I will retweet!

        1 reply . 0 retweets 42 likes
      3. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018
        Replying to @JohnHuth1 @DawnSunrise1

        Thank you! Changing it to 23.4 (rounding down). (Rendering now, tis slow)

        1 reply . 0 retweets 40 likes
      4. John Huth‏ @JohnHuth1 29 Dec 2018
        Replying to @physicsJ @DawnSunrise1

        Oh, gosh, I didn't mean for you to redo it! Like I said, great graphic. I only know that value by heart because I do celestial navigation.

        2 replies . 0 retweets 42 likes
      5. Dawn‏ @DawnSunrise1 29 Dec 2018
        Replying to @JohnHuth1 @physicsJ

        I love the fact that James was straight on it after your comment!

        1 reply . 0 retweets 33 likes
      6. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018
        Replying to @DawnSunrise1 @JohnHuth1

        Haha, I was already doing a large correction for Venus (I used the Solar day, oops!). My key point in this was to be as precise as possible, since there's soooo many wrong versions out there.

        2 replies . 1 retweet 65 likes
      7. Dawn‏ @DawnSunrise1 29 Dec 2018
        Replying to @physicsJ @JohnHuth1

        Respect for trying to get it right!

        1 reply . 0 retweets 32 likes
      8. 1 more reply
      1. New conversation
      2. Benjamin Hall‏ @BeshBashBosh 29 Dec 2018
        Replying to @physicsJ

        Nice! What did you use?

        1 reply . 0 retweets 1 like
      3. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018
        Replying to @BeshBashBosh

        Adobe After Effects, although I think there must be an easier tool out there

        1 reply . 1 retweet 4 likes
      4. Benjamin Hall‏ @BeshBashBosh 29 Dec 2018
        Replying to @physicsJ

        If you ever want a cheaper alternative to after effect check out Haiku -https://www.haiku.ai/ 

        1 reply . 2 retweets 13 likes
      5. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018
        Replying to @BeshBashBosh

        Cool thanks! Adobe is pricy, and many workarounds were needed on this animation 😕

        1 reply . 0 retweets 3 likes
      6. Benjamin Hall‏ @BeshBashBosh 29 Dec 2018
        Replying to @physicsJ

        Yeah I hate the adobe pricing model so try and find decent alternatives where possible. The @affinitybyserif suite (photo and designer) are pretty excellent photoshop and illustrator alternatives

        1 reply . 3 retweets 6 likes
      7. Dr. James O'Donoghue‏ @physicsJ 29 Dec 2018
        Replying to @BeshBashBosh @affinitybyserif

        That's great! Thanks for linking. Now I just need something to replace Premier Pro...

        1 reply . 0 retweets 1 like
      8. 1 more reply

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