Table 1.
Influence of altitude on the visible area of the solar disc.
| Altitude | θ | θrad | dmax | Visible surface area |
|---|---|---|---|---|
| (km) | (deg) | (rad) | (km) | (% of solar disc) |
| 2000 | 4.3° | 0.0757 | 52 700 | 0.29% |
| 5000 | 6.8° | 0.1195 | 83 100 | 0.71% |
| 10 000 | 9.7° | 0.1685 | 117 200 | 1.42% |
| 20 000 | 13.6° | 0.2370 | 164 900 | 2.79% |
| 30 000 | 16.5° | 0.2885 | 200 700 | 4.13% |
| 50 000 | 21.1° | 0.3683 | 256 200 | 6.71% |
| 100 000 | 29.0° | 0.5068 | 352 600 | 12.57% |
| 300 000 | 45.7° | 0.7972 | 554 600 | 30.13% |
| 1RSun | 60.0° | 1.0472 | 728 500 | 50.0% |
| 2RSun | 70.5° | 1.2310 | 856 400 | 66.67% |
| 3RSun | 75.5° | 1.3181 | 917 000 | 75.0% |
| 5RSun | 80.4° | 1.4033 | 976 300 | 83.33% |
Notes. For a range of altitudes, we list the values of the polar angle θ representing the maximum extent of the solar surface visible from that altitude, the arc length dmax representing the maximum visible distance, and the percentage of the solar hemisphere visible from that altitude.
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