a departure from what is normal, usual, or expected, typically an unwelcome one.

an optical phenomenon caused by the earth's motion around the sun.

अपसामान्य भ्रामण

English Usage: The astronomers discussed the implications of diurnal aberration on their calculations.

Hindi Usage: खगोलज्ञों ने अपनी गणनाओं पर दिन-प्रतिदिन की अपसामान्य भ्रामण के प्रभावों पर चर्चा की।