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Kiwi Geoff · (This post was last modified: 02-09-2015 10:16 AM by Kiwi Geoff.)

Hello Jeff O,
Thank you for making the WP34s "RS" code available.
I was interested to find out how accurate a few lines of trig on a calculator could be - and was *astonished* how well your program predicts the Sunrise / Sunset.
Here is a graph that shows how well your program works compared to a JPL ephemeris (DE200). Using the default location and UTC offset in your code.
[Image: 2015_SR_diff.png]

The averaged "sunrise error" is just 1 second over 2015.
This is more than enough accuracy for the purpose - because "optical effects" on the horizon can have a much greater effect on when we 'see' the sunrise.
Here is a sample of the DE200 derived "RS" for April 2015 for those that would like to run your program Jeff, and have an accurate reference to show just how well the WP34s program performs. Using the default location and UTC offset in the code.

Code:

2015-04-01 r  07:09:15.878  Az =  83.874

2015-04-01 t  13:26:02.520  El =  59.503

2015-04-01 s  19:43:23.599  Az = 276.373

2015-04-02 r  07:07:52.315  Az =  83.403

2015-04-02 t  13:25:44.701  El =  59.888

2015-04-02 s  19:44:11.555  Az = 276.845

2015-04-03 r  07:06:29.010  Az =  82.932

2015-04-03 t  13:25:27.009  El =  60.271

2015-04-03 s  19:44:59.498  Az = 277.315

2015-04-04 r  07:05:05.996  Az =  82.464

2015-04-04 t  13:25:09.463  El =  60.653

2015-04-04 s  19:45:47.441  Az = 277.783

2015-04-05 r  07:03:43.302  Az =  81.997

2015-04-05 t  13:24:52.088  El =  61.033

2015-04-05 s  19:46:35.396  Az = 278.249

2015-04-06 r  07:02:20.962  Az =  81.532

2015-04-06 t  13:24:34.904  El =  61.411

2015-04-06 s  19:47:23.375  Az = 278.714

2015-04-07 r  07:00:59.005  Az =  81.070

2015-04-07 t  13:24:17.933  El =  61.787

2015-04-07 s  19:48:11.389  Az = 279.176

2015-04-08 r  06:59:37.464  Az =  80.609

2015-04-08 t  13:24:01.195  El =  62.162

2015-04-08 s  19:48:59.450  Az = 279.636

2015-04-09 r  06:58:16.369  Az =  80.151

2015-04-09 t  13:23:44.712  El =  62.534

2015-04-09 s  19:49:47.565  Az = 280.094

2015-04-10 r  06:56:55.752  Az =  79.695

2015-04-10 t  13:23:28.503  El =  62.904

2015-04-10 s  19:50:35.745  Az = 280.549

2015-04-11 r  06:55:35.644  Az =  79.241

2015-04-11 t  13:23:12.587  El =  63.272

2015-04-11 s  19:51:23.995  Az = 281.002

2015-04-12 r  06:54:16.074  Az =  78.790

2015-04-12 t  13:22:56.983  El =  63.638

2015-04-12 s  19:52:12.321  Az = 281.452

2015-04-13 r  06:52:57.073  Az =  78.342

2015-04-13 t  13:22:41.708  El =  64.001

2015-04-13 s  19:53:00.727  Az = 281.900

2015-04-14 r  06:51:38.669  Az =  77.897

2015-04-14 t  13:22:26.775  El =  64.362

2015-04-14 s  19:53:49.215  Az = 282.344

2015-04-15 r  06:50:20.891  Az =  77.454

2015-04-15 t  13:22:12.201  El =  64.720

2015-04-15 s  19:54:37.783  Az = 282.786

2015-04-16 r  06:49:03.766  Az =  77.014

2015-04-16 t  13:21:57.997  El =  65.076

2015-04-16 s  19:55:26.431  Az = 283.225

2015-04-17 r  06:47:47.318  Az =  76.578

2015-04-17 t  13:21:44.174  El =  65.428

2015-04-17 s  19:56:15.154  Az = 283.660

2015-04-18 r  06:46:31.572  Az =  76.145

2015-04-18 t  13:21:30.742  El =  65.778

2015-04-18 s  19:57:03.946  Az = 284.092

2015-04-19 r  06:45:16.552  Az =  75.715

2015-04-19 t  13:21:17.709  El =  66.125

2015-04-19 s  19:57:52.801  Az = 284.520

2015-04-20 r  06:44:02.282  Az =  75.289

2015-04-20 t  13:21:05.084  El =  66.469

2015-04-20 s  19:58:41.712  Az = 284.945

2015-04-21 r  06:42:48.788  Az =  74.866

2015-04-21 t  13:20:52.876  El =  66.809

2015-04-21 s  19:59:30.672  Az = 285.367

2015-04-22 r  06:41:36.093  Az =  74.447

2015-04-22 t  13:20:41.094  El =  67.146

2015-04-22 s  20:00:19.671  Az = 285.784

2015-04-23 r  06:40:24.225  Az =  74.031

2015-04-23 t  13:20:29.747  El =  67.480

2015-04-23 s  20:01:08.704  Az = 286.198

2015-04-24 r  06:39:13.212  Az =  73.620

2015-04-24 t  13:20:18.847  El =  67.811

2015-04-24 s  20:01:57.764  Az = 286.608

2015-04-25 r  06:38:03.079  Az =  73.213

2015-04-25 t  13:20:08.402  El =  68.138

2015-04-25 s  20:02:46.843  Az = 287.013

2015-04-26 r  06:36:53.856  Az =  72.810

2015-04-26 t  13:19:58.425  El =  68.461

2015-04-26 s  20:03:35.934  Az = 287.414

2015-04-27 r  06:35:45.572  Az =  72.411

2015-04-27 t  13:19:48.925  El =  68.780

2015-04-27 s  20:04:25.031  Az = 287.811

2015-04-28 r  06:34:38.253  Az =  72.017

2015-04-28 t  13:19:39.913  El =  69.096

2015-04-28 s  20:05:14.126  Az = 288.203

2015-04-29 r  06:33:31.931  Az =  71.627

2015-04-29 t  13:19:31.401  El =  69.407

2015-04-29 s  20:06:03.211  Az = 288.591

2015-04-30 r  06:32:26.633  Az =  71.242

2015-04-30 t  13:19:23.398  El =  69.715

2015-04-30 s  20:06:52.277  Az = 288.974

Many thanks for the program Jeff.

Regards, Kiwi Geoff (Christchurch, New Zealand).