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No one answered before so I'll try again :-) Call me persistent!
Why are the landing times getting later w/each day - the launch times got earlier each day - is that always the case or did they do something different this time around? Secondly, if they prefer day landings to night ones, and the weather forecast looks to be ideal for each opportunity tomorrow, would they consider only focusing on the second chance? On STS-85 they did that; only targeted the daylight chance and were going to focus on both chances if they'd been waived off a day for the 2nd time, at which point they'd also have called up Edwards.. |
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Danny Dot wrote:
wrote in message oups.com... No one answered before so I'll try again :-) Call me persistent! Why are the landing times getting later w/each day - the launch times got earlier each day - is that always the case or did they do something different this time around? Secondly, if they prefer day landings to night ones, and the weather forecast looks to be ideal for each opportunity tomorrow, would they consider only focusing on the second chance? On STS-85 they did that; only targeted the daylight chance and were going to focus on both chances if they'd been waived off a day for the 2nd time, at which point they'd also have called up Edwards.. I worked for NASA for 15 years and never did figure out launch and landing windows. I have been in many meetings that had charts with about 100 lines on them discussing the subject. I think NASA hires autistic savants to understand this stuff, e.g. the movie Rain Man. It is in my opinion impossible for a normal person to understand the subject :-) I think it would be easier to solve the Unified Field Theorem than to figure out launch and landing windows :-) Danny Dot www.mobbinggonemad.org |
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wrote in message oups.com... No one answered before so I'll try again :-) Call me persistent! Why are the landing times getting later w/each day - the launch times got earlier each day - is that always the case or did they do something different this time around? I believe that's pretty much always the case. Basically as ISS orbits the earth, its orbit precesses around the planet so that the plane of the orbit changes over time. So, from the POV of the Earth, the shuttle has to launch about an hour earlier in order to intercept the orbital plane. For descent, you have something similar, but now you can land on the "ascending" or "descending" node. (i.e. does it approach from the north or south essentially. But there are constraints on that so as to avoid populated areas, etc.) Secondly, if they prefer day landings to night ones, and the weather forecast looks to be ideal for each opportunity tomorrow, would they consider only focusing on the second chance? On STS-85 they did that; only targeted the daylight chance and were going to focus on both chances if they'd been waived off a day for the 2nd time, at which point they'd also have called up Edwards.. |
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That's what I thought too (ascending v. descending). But I thought
that meant drastically changing their sleep patterns and also that they'd come in from the north - I remember one coming back from Mir (STS-74 I think) and seeing spectacular footage later of them coming across southern Alaska and the Canadian Rockies and across the midwest and south into KSC.. but this one's coming from the south like 'normal' Oh well.. Greg D. Moore (Strider) wrote: wrote in message oups.com... No one answered before so I'll try again :-) Call me persistent! Why are the landing times getting later w/each day - the launch times got earlier each day - is that always the case or did they do something different this time around? I believe that's pretty much always the case. Basically as ISS orbits the earth, its orbit precesses around the planet so that the plane of the orbit changes over time. So, from the POV of the Earth, the shuttle has to launch about an hour earlier in order to intercept the orbital plane. For descent, you have something similar, but now you can land on the "ascending" or "descending" node. (i.e. does it approach from the north or south essentially. But there are constraints on that so as to avoid populated areas, etc.) Secondly, if they prefer day landings to night ones, and the weather forecast looks to be ideal for each opportunity tomorrow, would they consider only focusing on the second chance? On STS-85 they did that; only targeted the daylight chance and were going to focus on both chances if they'd been waived off a day for the 2nd time, at which point they'd also have called up Edwards.. |
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"Danny Dot" wrote in message ... I worked for NASA for 15 years and never did figure out launch and landing windows. I have been in many meetings that had charts with about 100 lines on them discussing the subject. I think NASA hires autistic savants to understand this stuff, e.g. the movie Rain Man. It is in my opinion impossible for a normal person to understand the subject :-) I think it would be easier to solve the Unified Field Theorem than to figure out launch and landing windows :-) I take it you never studied orbital mechanics? Jeff -- "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety" - B. Franklin, Bartlett's Familiar Quotations (1919) |
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