(55) Additional Moon Tracking Computer and Calculator Programs
01-15-2019, 02:37 PM
Post: #1
 SlideRule Senior Member Posts: 1,287 Joined: Dec 2013
(55) Additional Moon Tracking Computer and Calculator Programs
Elevation & azimuth routines from Additional Moon Tracking Computer and Calculator Programs, EIMACS.

… two scientific calculator programs … two equations used for these programs are:
Elevation = …
Azimuth= …

HP-55 Program Form
EME Antenna AZ and EL from Moon's GHA and declination

BEST!
SlideRule
10-15-2019, 11:14 AM
Post: #2
 Greg Junior Member Posts: 23 Joined: Jan 2016
RE: (55) Additional Moon Tracking Computer and Calculator Programs
Thanks SlideRule. It is really interesting to see how the early calculators behave. I find this program especially interesting because of how much you need to key in to get it started after loading the program. It really shows the impact of providing fully merged keystrokes in later models.

The HP-25 version, also in the article, uses less program steps and does the tedium of storing the sin/cos of your latitude and longitude within the program. You need to calculate those and store them manually as part of the setup for the HP-55 version.

The HP-55 program in hp55u format is:
Code:
 PROG 49 01: 34       : RCL 02: 08       : 8 03: 71       : * 04: 34       : RCL 05: 05       : 5 06: 71       : * 07: 34       : RCL 08: 07       : 7 09: 34       : RCL 10: 04       : 4 11: 71       : * 12: 61       : + 13: 32       : g 14: 12       : sin-1 15: 33       : STO 16: 00       : 0 17: 31       : f 18: 14       : tan 19: 34       : RCL 20: 06       : 6 21: 71       : * 22: 34       : RCL 23: 07       : 7 24: 34       : RCL 25: 05       : 5 26: 81       : / 27: 34       : RCL 28: 00       : 0 29: 31       : f 30: 13       : cos 31: 81       : / 32: 22       : x<->y 33: 51       : - 34: 32       : g 35: 13       : cos-1 36: 00       : 0 37: 34       : RCL 38: 09       : 9 39: 31       : f 40: -48      : x<=y? 48 41: 23       : Rv 42: 23       : Rv 43: 34       : RCL 44: 02       : 2 45: 22       : x<->y 46: 51       : - 47: -00      : GTO 00 48: 23       : Rv 49: 23       : Rv DATA 20 00: 0 01: 0 02: 360 03: 0 04: 0 05: 0 06: 0 07: 0 08: 0 09: 0 10: 0 11: 0 12: 0 13: 0 14: 0 15: 0 16: 0 17: 0 18: 0 19: 0 STATE 3 DEG FIX 2 HELP 33 EME Antenna AZ and EL from Moon's GHA and Declination https://www.hpmuseum.org/forum/ thread-12199.html 1. Antenna Long. (deg)    STO 3 2. Antenna Lat. (deg)    ENTER ENTER    f sin STO 4    Rv f cos STO 5    Rv f tan STO 6 3. Moon Declination (d.ms, south is -ve)    f ->H    ENTER    f sin STO 7    Rv f cos STO 8 4. Moon GHA (d.ms)    f ->H    RCL 3 - ENTER    f sin STO 9    Rv f cos 5. BST R/S Gives Azimuth (deg). RCL 0 for Elevation (deg). For new moon data, go to step 3. END

You can copy and paste that into Menu (click the LED display), Prog/Data of the hp55u emulator. It should also be a good starting point for any other HP-55 emulators around.

On a HP-55, BST in RUN mode takes you to step 00.

- Greg from sydneysmith.com
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