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yes..thanks. I got it to work ok. Thank you! !!

I tried under dos. Got message about not liking it but switched to windows 7 now so exact same setup here now as you. I am playing with it now. I dont get menu pages though that you mention. I get output but not exactly like your example when going beyone the first 3 columns so Iam checking out...

What are you running your version of the program in? windows? dos? What type of machine? Trying it in DOS i get "The program cannot be run in DOS mode.

Looks like you might have got it to work!! Yea! I am going to spend some time thinking and looking at what you did and respond more later today.

The Part of the data files .dat which are EBCDIC are easy to read and convert to .asc but arent used in the EP .dat files which are the problem files. I figured out the EBCDIC parts. Also any parts of the data files no matter the type SP, PT or EP etc which do simple conversions from binary to...

Thanks. I appreciate your enthusiasm. I have been through that already though and read the help text you refer to. msb stands for "microsoft binary" so its not mistake. Using any other setting besides PC for h meant the results output for PT or AT or SP were wrong. Only setting h = pc made...

It is designed specifically for this data so it should work. It works ok with the other few data types like PULSE, SPIN etc. I got those to work already. The EP files are just larger and have double precision values in them. Not sure if that makes a difference but it might.

thanks for trying!

Ya. Thanks for checking that out. I dont think emulation will work.

Yep thats the error. A pentium III might not even be old enough hardware. I guess those showed up around 1999?

Yep..Thats what I get! :(

Yes Error R6000, stack overflow is what i get. Ya I tried to compile as well but it wouldnt work and have studied source code very closely and tried to do some bit math by hand but failed. You have to do some format conversions from IBM370 to IEEE which adds to confusion for me. Probably beyond...

Ok here is the program to download. https://pds-ppi.igpp.ucla.edu/volume/PV05_0001/SOFTWARE/DOS/ sedr2asc.exe That same directory contains instructions on use. Go to this link. https://pds-ppi.igpp.ucla.edu/data/PVO-V-POS-6-SEDR-ORBITATTITUDE--V1.0/DATA/EPHEM/ORB0001/ Download: EP0001.DAT you...

Do you own an old 486 computer or one made in the early 90s? I have old nasa orbital data trapped in a executable file that was complied by them in the early 90s on old computers. It wont run on modern computers. It runs on DOS. It wont work with DOS running in Virtual box or even a new modern...

what programming language are you using?

Thanks I will check out your info and let you know how it goes.

Do you by chance have an example that tested ok for you using this? I like to know I wrote my program correctly. I have to convert this to a different programming language. What value did you use for mu? Thanks this is helpful.

Thank you but I am not sure we are on the same page. I already have the time of flight between between the two points and the two points position in space. My understanding is I need at least the semi-major axis to reconstruct the orbital ellipse which fits between the two points. Then when you...

If I look at your link https://en.wikipedia.org/wiki/Lambert's_problem Do you know where s1 and s2 come from? They dont illustrate it in their diagrams. Iam a visual learner so kinda need to see it. I dont have enough info to find F2 from this do I ?

thank you. Lots of good information to check out in your post. I was suspecting I needed more information about my orbit ellipse to get my answer. Looks like Lambert is the answer.