（尚未譯成中文）
Here in central Taiwan, the M-750 air route from Hong Kong to Japan passes a few kilometers from me. I will use the stars behind the planes to determine their height.
Assuming that planes follow their routes well and maybe looking up individual points, and using my own coordinates, I find route M-750 crosses 9338 meters due north of me. (See makefile, section how_far_north)
I wrote a python script to determine elevations from what stars the plane passes between. Here are results for several sample levels:
7000 36.9 77.3 7777 25515 8000 40.6 73.6 8777 28795 9000 43.9 70.2 9777 32076 10000 47.0 67.2 10777 35357 11000 49.7 64.5 11777 38638 12000 52.1 62.1 12777 41919 13000 54.3 59.9 13777 45200 14000 56.3 57.9 14777 48480
Fields:
I will lie in wait with binoculars for a plane to pass. As it passes above polaris (the north star), I will note what stars it is passing between, and consulting a star atlas or program, I will find the declination of those stars and thus the plane. Then from the above table, I will estimate their height.
Here are some bright stars I might consider for reference as they pass over the meridian (straight up from polaris). (See makefile, section star)
Declination, right ascension, constellation, name, magnitude:
59:8:59 0:9:10 Cas Beta 2.27 60:14:7 1:25:49 Cas Delt 2.68 60:43:0 0:56:42 Cas Gamm 2.47 61:30:51 16:23:59 Dra Eta 2.74 61:45:3 11:3:43 UMa Alph 1.79 62:35:8 21:18:34 Cep Alph 2.44 74:9:20 14:50:42 UMi Beta 2.08
I am careful not to mention "flight levels", as those are related to air pressure.
Last modified: 2019-05-06 14:55:31 +0800