Timeline for How to calculate the speed of rotation of a given point on the Earth's WGS84 ellipsoid, about its axis?
Current License: CC BY-SA 4.0
13 events
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| Jun 19, 2020 at 8:05 | comment | added | user20636 | The link gave the speed as 460 meters per second, which would be 1640-1670 km/h, depending on rounding. | |
| Feb 9, 2019 at 15:53 | history | edited | uhoh | CC BY-SA 4.0 |
sin^2
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| Jun 1, 2018 at 10:52 | comment | added | uhoh | No, I don't see 1,609 kph there anywhere there. All I see is 'Thus, the surface of the earth at the equator moves at a speed of 460 meters per second--or roughly 1,000 miles per hour." Those are rough, round numbers and you should not use them to compare to a calculation. | |
| Jun 1, 2018 at 10:47 | comment | added | uhoh |
Also I didn't see your message until it came up in the review queue. You have to use the @ symbol (like @uhoh) to be sure someone receives a notification of your message.
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| Jun 1, 2018 at 10:46 | comment | added | uhoh | Hi @EduardoCRojas , I'll take look now. I think you are using an answer post to ask a question because you can not yet comment on other people's posts until you get a reputation of 50. That comes pretty quick if you participate more. Once this is cleared up, it's best i you delete this answer since it isn't an answer. Also, I noticed the similarity between your username and the OP's (original poster = question asker). If both usernames belong to the same person, there may be a way to merge and combine scores. | |
| Jun 1, 2018 at 7:51 | comment | added | Eduardo C Rojas | Great! Thanks. But why is the answer 1,618 or 1,620KPH at Manila Philippines' Latitude so close and even faster than the speed at the equator? Equator surface speed is 1,609 KPH per this link: scientificamerican.com/article/how-fast-is-the-earth-mov | |
| May 19, 2018 at 0:05 | comment | added | uhoh | @MattJessick ha! I forgot the 2π relating radius to circumference. Great catch, thank you! I've make an edit and added the step explicitly. | |
| May 19, 2018 at 0:05 | history | edited | uhoh | CC BY-SA 4.0 |
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| May 18, 2018 at 23:30 | comment | added | Matt Jessick | (All very good, but you are off by a factor of 6. The spherical Earth velocity about the Earth's rotation axis at 14.6 deg latitude is more like 450 m/s. I suspect you might have used distance from Earth +Z axis as R Sin(latitude), rather than the correct R cos(latitude)) | |
| May 13, 2018 at 4:40 | history | rollback | uhoh |
Rollback to Revision 2
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| May 13, 2018 at 4:39 | history | edited | uhoh | CC BY-SA 4.0 |
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| May 11, 2018 at 9:56 | history | edited | uhoh | CC BY-SA 4.0 |
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| May 11, 2018 at 9:29 | history | answered | uhoh | CC BY-SA 4.0 |