I cooked up a naive energy study for my home, Salt Lake City, to help
me explain to my children why it is hot in the summer and cold in the
winter. I used the xephem program as a calculator to compute the sine
of the sun's altitude at fifteen minute intervals over the course of
the day for March 21, 1999, June 21, 1999, and December 21, 1999 as
viewed from Salt Lake City. xephem is freely available from
http://www.ClearSkyInstitute.com/xephem/xephem.html
It occurred to me that this may be of interest to this group, so I
include the text below. Lines beginning with 'M' denote March, etc.
Each line displays a time of day (Mountain Standard Time) and the sine
of the sun's altitude.
I also have gif and postscript files displaying the plot (each about
18 K) which I will send out on request. Perhaps someone will
volunteer to make them available on a web page for others to access if
there is sufficient interest.
I also have alt-azimuthal plots for the three days (actually four
days; I also did September 21 for this), in gif format, which I am
also willing to send out or place on a web page.
Jim
------------------- ---------------------- --------------------
| Jim Cobb | 540 Arapeen Dr. #100 | [EMAIL PROTECTED] |
| Parametric | Salt Lake City, UT | (801)-588-4632 |
| Technology Corp. | 84108-1202 | Fax (801)-588-4650 |
------------------- ---------------------- --------------------
Technology...the knack of so arranging the world that we don't have to
experience it. -- Max Frisch
____________________________________________________________
M,6.49138888903,-0.00454486881357
M,6.74138888897,0.0390374829229
M,6.99138888891,0.0864242448893
M,7.24138888903,0.134635254135
M,7.49138888897,0.182715374524
M,7.74138888891,0.230221231284
M,7.99138888903,0.276867684141
M,8.24138888897,0.322379606861
M,8.49138888891,0.36656333899
M,8.74138888903,0.409216261651
M,8.99138888897,0.450147838368
M,9.24138888891,0.489177790952
M,9.49138888903,0.526135645054
M,9.74138888897,0.560860929353
M,9.99138888891,0.593203428712
M,10.241388889,0.623023467673
M,10.491388889,0.650192589515
M,10.7413888889,0.67459385983
M,10.991388889,0.696122320429
M,11.241388889,0.714685576033
M,11.4913888889,0.730203862409
M,11.741388889,0.742610633332
M,11.991388889,0.751852761299
M,12.2413888889,0.757890678592
M,12.491388889,0.760698601247
M,12.741388889,0.760264674602
M,12.9913888889,0.756590983069
M,13.241388889,0.749693464055
M,13.491388889,0.739602086716
M,13.7413888889,0.726360340419
M,13.991388889,0.71002548921
M,14.241388889,0.69066800168
M,14.4913888889,0.668371339663
M,14.741388889,0.643231779163
M,14.991388889,0.615357765787
M,15.2413888889,0.584869772839
M,15.491388889,0.551899603852
M,15.741388889,0.516590026883
M,15.9913888889,0.47909439747
M,16.241388889,0.439576151326
M,16.491388889,0.398208559083
M,16.7413888889,0.355174715301
M,16.991388889,0.310668383791
M,17.241388889,0.264896030931
M,17.4913888889,0.218052152998
M,17.741388889,0.170428945612
M,17.991388889,0.122332027988
M,18.2413888889,0.0742777360504
M,18.491388889,0.0275091931069
M,18.741388889,-0.0141067996457
J,4.93222222233,-0.0045415992146
J,5.18222222227,0.0322647448622
J,5.43222222221,0.0733608955786
J,5.68222222233,0.116443679102
J,5.93222222227,0.160617774946
J,6.18222222221,0.205442220347
J,6.43222222233,0.250620912805
J,6.68222222227,0.29591789221
J,6.93222222221,0.341090610759
J,7.18222222233,0.385948078311
J,7.43222222227,0.430288573731
J,7.68222222221,0.473916094926
J,7.93222222233,0.516639883976
J,8.18222222227,0.558274124089
J,8.43222222221,0.598638656708
J,8.68222222233,0.637559203071
J,8.93222222227,0.674867953984
J,9.18222222221,0.710404408988
J,9.43222222233,0.744015702765
J,9.68222222227,0.775557460558
J,9.93222222221,0.804894200052
J,10.1822222223,0.831899999998
J,10.4322222223,0.856458864823
J,10.6822222222,0.878465527095
J,10.9322222223,0.897825408632
J,11.1822222223,0.914455442418
J,11.4322222222,0.928284244688
J,11.6822222223,0.939252356552
J,11.9322222223,0.947312633505
J,12.1822222222,0.952430276304
J,12.4322222223,0.954583218552
J,12.6822222223,0.953762175069
J,12.9322222222,0.949970700768
J,13.1822222223,0.943225122872
J,13.4322222223,0.933554564443
J,13.6822222222,0.921000690069
J,13.9322222223,0.905617388634
J,14.1822222223,0.887470869374
J,14.4322222222,0.866638940632
J,14.6822222223,0.843210992323
J,14.9322222223,0.817287665508
J,15.1822222222,0.788980178295
J,15.4322222223,0.758410019775
J,15.6822222223,0.725708521245
J,15.9322222222,0.691016093388
J,16.1822222223,0.654481904504
J,16.4322222223,0.616263129445
J,16.6822222222,0.576524319385
J,16.9322222223,0.535436943294
J,17.1822222223,0.493178588237
J,17.4322222222,0.449932655676
J,17.6822222223,0.405887686601
J,17.9322222223,0.361237259252
J,18.1822222222,0.316180430032
J,18.4322222223,0.270922837342
J,18.6822222223,0.22565312609
J,18.9322222222,0.180637677588
J,19.1822222223,0.136129833674
J,19.4322222223,0.09248657555
J,19.6822222222,0.0503332459875
J,19.9322222223,0.0111773535739
J,20.1822222223,-0.0216831584485
D,7.79611111118,-0.00453610999457
D,8.04611111112,0.0319912539036
D,8.29611111124,0.0706353315471
D,8.54611111118,0.109021539735
D,8.79611111112,0.146291023752
D,9.04611111124,0.182042595041
D,9.29611111118,0.216023562561
D,9.54611111112,0.248041237573
D,9.79611111124,0.277944650981
D,10.0461111112,0.305563123359
D,10.2961111111,0.330788370805
D,10.5461111112,0.353506398659
D,10.7961111112,0.373616030033
D,11.0461111111,0.391028476092
D,11.2961111112,0.405667316253
D,11.5461111112,0.417468567376
D,11.7961111111,0.426380761109
D,12.0461111112,0.432365185752
D,12.2961111112,0.435395794841
D,12.5461111111,0.435459427968
D,12.7961111112,0.432555823935
D,13.0461111112,0.426697570125
D,13.2961111111,0.417910151394
D,13.5461111112,0.406231772308
D,13.7961111112,0.391713339597
D,14.0461111111,0.374418312801
D,14.2961111112,0.35442254077
D,14.5461111112,0.331814309853
D,14.7961111111,0.306694297439
D,15.0461111112,0.279175880511
D,15.2961111112,0.249367153462
D,15.5461111111,0.217437424978
D,15.7961111112,0.183536927551
D,16.0461111112,0.147856659574
D,16.2961111111,0.110645602574
D,16.5461111112,0.0722949076094
D,16.7961111112,0.0336303276144
D,17.0461111111,-0.00307262738605
