HP-35A/21 D.MS<-->Decimal degrees routines - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: HP-35A/21 D.MS<-->Decimal degrees routines (/thread-215871.html) HP-35A/21 D.MS<-->Decimal degrees routines - Matt Agajanian - 03-28-2012 Hello all, In that the HP-21 (Woodstock) and HP-35 (Classic) do not have conversions to and from degrees to degrees/minutes/seconds, has anyone devised a method to convert the decimal degree value to degrees-minutes-seconds? Please let me know. Thanks Edited: 28 Mar 2012, 8:50 p.m. Re: HP-35A/21 D.MS<-->Decimal degrees routines - Eric Smith - 03-28-2012 Not anything automatic. You can obviously do it by working through the calculations manually. Re: HP-35A/21 D.MS<-->Decimal degrees routines - Gerson W. Barbosa - 03-28-2012 From Hewlett-Packard's HP-35 MATH PAC, available in the HP Museum DVD 1, Calculator Manuals: ```Degrees, minutes and seconds to decimal degrees LINE DATA OPERATIONS DISPLAY REMARKS 1 Seconds ENTER^ 6 0 STO / 2 Minutes + RCL / 3 Degrees + Example 32.6 ENTER^ 6 0 STO / .5433333333 17 + RCL / .2923888888 46 + 46.29238889 46°17'32.6" = 46.29° Decimal degrees to degrees, minutes and seconds LINE DATA OPERATIONS DISPLAY REMARKS 1 X ENTER^ Let D = integer part of X 2 D Degrees 3 - 6 0 STO * A Let M = integer part of A 4 M Minutes 5 - RCL * B Let S = nearest integer to B 6 S Seconds Example 23.32916667 ENTER^ 23.32916667 23 23. Degrees (integer part of X) - 6 0 STO * 19.7500002 19 19. Minutes (integer part of X) - RCL * 45.000012 45 45 Seconds (nearest integer to X) 23.32916667° = 23°19'45"``` Re: HP-35A/21 D.MS<-->Decimal degrees routines - Paul Dale - 03-28-2012 Quote:```LINE DATA OPERATIONS DISPLAY REMARKS 1 Seconds ENTER^ 6 0 STO / 2 Minutes + RCL / 3 Degrees +``` Interesting, using the single storage register and saving no keystrokes in doing so.... Likewise for the reverse conversion. - Pauli Edited: 28 Mar 2012, 10:54 p.m. Re: HP-35A/21 D.MS<-->Decimal degrees routines - dbatiz - 03-29-2012 There was a tread not too long ago where somebody posted equations that accomplish this. He made his posting as a guessing game, something about "Try to identify these" or something like that. I did a quick search, but came up empty handed. Does this ring any bells? Very respectfully, David Re: HP-35A/21 D.MS<-->Decimal degrees routines - Gerson W. Barbosa - 03-29-2012 Here it is: Regards, Gerson. Re: HP-35A/21 D.MS<-->Decimal degrees routines - Gerson W. Barbosa - 03-29-2012 Quote: Interesting, using the single storage register and saving no keystrokes in doing so.... ...unless more than one conversion is performed, but then the instructions should be updated: ```LINE DATA OPERATIONS DISPLAY REMARKS 1 Seconds ENTER^ 6 0 STO / for the second and subsequent conversions execute the following operations instead: ENTER^ RCL / 2 Minutes + RCL / 3 Degrees +``` Gerson. Edited: 29 Mar 2012, 7:52 a.m. Re: HP-35A/21 D.MS<-->Decimal degrees routines - Marcus von Cube, Germany - 03-29-2012 RCL should make ENTER^ superfluous. Re: HP-35A/21 D.MS<-->Decimal degrees routines - Matt Agajanian - 03-29-2012 Hello all. Fantastic job on the D.MS<-->D.DDD conversion routines. I tried developing some algorithms last night. In comparison, yours were quite streamlined. Re: HP-35A/21 D.MS<-->Decimal degrees routines - Gerson W. Barbosa - 03-29-2012 Right you are! This means more keystroke saving on multiple conversions. I guess surveyors appreciated the successor of the HP-35, the HP-45, when it was released. Still not programmable, but it had ->D.MS and D.MS-> built-in :-) Also, a nice feature: no matter the current display mode, ->D.MS would leave the calculator temporarily in FIX 4 mode. Edited: 29 Mar 2012, 2:12 p.m.