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Astronomy Course RA course formulas
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| import math | |
| AU_METER = 1.49597870691e11 #MS | |
| AU_KM = 1.49597870691e8 | |
| SEC = 1 | |
| MIN = SEC * 60 | |
| HOUR = MIN * 60 | |
| DAY = 24 * HOUR | |
| YEAR = DAY * 365 | |
| G = 6.673e-11 | |
| M_EARTH = 5.97219e24 | |
| R_EARTH = 6.371e6 # In M/S | |
| M_SUN = 1.9891e30 | |
| R_SUN = 6.95508e8 # In M/S | |
| def parallax_distance_au(angle_in_arcseconds): | |
| """ | |
| >> parallax_distance_au(0.742) | |
| 277985.17520215636 | |
| """ | |
| return 206265 / angle_in_arcseconds | |
| def parallax_distance_parsec(angle_in_arcseconds): | |
| """ | |
| >> parallax_distance_au(0.742) | |
| 1.3477088948787062 | |
| """ | |
| return (1 / angle_in_arcseconds) | |
| def parallax_distance_arc_length_au(distance_parsec, angle_in_arcseconds): | |
| return angle_in_arcseconds * distance_parsec | |
| def escape_velocity(m, r): | |
| return math.sqrt((2.0 * G * float(m)) / float(r)) |
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