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retrograde motion
Isn't mars going to retrograde in motion as earth overtakes it in August?
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#2
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retrograde motion
"bwhiting" wrote in message ... Mick, of course.....all the outer planets retrograde (move westward across the backdrop of stars) during opposition. Mars began retrograding on July 30 and becomes stationary in RA on Sept 29 at 14 hr UT. And resumes direct motion. [So its moved from 22 hr 56 min on July 30 to a point 22hr 16 min on Sept 29.] Clear Skies, Tom W. Ok..why doesn't become stationary at opposition on Aug 27 when earth is parallel? |
#3
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retrograde motion
"bwhiting" wrote in message ... Mick, of course.....all the outer planets retrograde (move westward across the backdrop of stars) during opposition. Mars began retrograding on July 30 and becomes stationary in RA on Sept 29 at 14 hr UT. And resumes direct motion. [So its moved from 22 hr 56 min on July 30 to a point 22hr 16 min on Sept 29.] Clear Skies, Tom W. Ok..why doesn't become stationary at opposition on Aug 27 when earth is parallel? |
#4
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retrograde motion
Mick wrote:
Ok..why doesn't become stationary at opposition on Aug 27 when earth is parallel? At opposition the Earth is passing by Mars so the red planet appears to be going "backwards". In fact, since we're on parallel paths the retrograde motion is maximized. And because it's closer to us then it seems to be backing up even faster than when the distance is greater. So Aug. 27 is roughly when it's in the middle of its retrograde loop and losing ground the fastest. Not until we're moving more in a line away from it rather than passing it by will it resume its apparent direct motion. Mike Simmons |
#5
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retrograde motion
Mick wrote:
Ok..why doesn't become stationary at opposition on Aug 27 when earth is parallel? At opposition the Earth is passing by Mars so the red planet appears to be going "backwards". In fact, since we're on parallel paths the retrograde motion is maximized. And because it's closer to us then it seems to be backing up even faster than when the distance is greater. So Aug. 27 is roughly when it's in the middle of its retrograde loop and losing ground the fastest. Not until we're moving more in a line away from it rather than passing it by will it resume its apparent direct motion. Mike Simmons |
#6
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retrograde motion
So, Claudius, have you forgotten to explain your epicycles?
;^) "Mike Simmons" wrote At opposition the Earth is passing by Mars so the red planet appears to be going "backwards". In fact, since we're on parallel paths the retrograde motion is maximized. And because it's closer to us then it seems to be backing up even faster than when the distance is greater. So Aug. 27 is roughly when it's in the middle of its retrograde loop and losing ground the fastest. Not until we're moving more in a line away from it rather than passing it by will it resume its apparent direct motion. Mike Simmons |
#7
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retrograde motion
So, Claudius, have you forgotten to explain your epicycles?
;^) "Mike Simmons" wrote At opposition the Earth is passing by Mars so the red planet appears to be going "backwards". In fact, since we're on parallel paths the retrograde motion is maximized. And because it's closer to us then it seems to be backing up even faster than when the distance is greater. So Aug. 27 is roughly when it's in the middle of its retrograde loop and losing ground the fastest. Not until we're moving more in a line away from it rather than passing it by will it resume its apparent direct motion. Mike Simmons |
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