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天文単位コンバーター

AU・光年・パーセク・kmなどの天文距離単位間で変換します。

変換結果

km1.49598e+8
AU (Astronomical Units)1
light-seconds499.005
light-minutes8.31675
light-hours0.138612
light-days0.00577552
light-years1.5813e-5
parsecs4.8481e-6

参考距離

Earth–Sun distance1 AU
Light from Sun to Earth~8.3 min
Nearest star (Proxima Cen.)4.24 ly
Milky Way diameter~100,000 ly
Andromeda Galaxy~2.537 million ly

よくある質問

コード実装

# Astronomical unit conversions (all in km)
TO_KM = {
    "km":  1,
    "au":  149_597_870.7,
    "ls":  299_792.458,        # light-second
    "lm":  17_987_547.48,      # light-minute
    "lh":  1_079_252_848.8,    # light-hour
    "ld":  25_902_068_371.2,   # light-day
    "ly":  9_460_730_472_580.8, # light-year
    "pc":  30_856_775_814_913.67, # parsec
}

def convert(value, from_unit, to_unit):
    km = value * TO_KM[from_unit]
    return km / TO_KM[to_unit]

# Examples
print(f"1 AU = {convert(1, 'au', 'km'):,.1f} km")
print(f"1 AU = {convert(1, 'au', 'ls'):.2f} light-seconds")
print(f"1 AU = {convert(1, 'au', 'lm'):.2f} light-minutes")
print(f"Nearest star (4.24 ly) = {convert(4.24, 'ly', 'au'):,.0f} AU")
print(f"1 parsec = {convert(1, 'pc', 'ly'):.2f} light-years")

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