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Astronomical Unit (a.u.) of Length


The astronomical unit (a.u.) is a unit of length used primarily in astronomy to describe distances within our solar system. It is defined as the average distance between the Earth and the Sun.


Key facts:



  • 1 astronomical unit ≈ 149,597,870.7 kilometers (about 93 million miles)



  • Used to measure distances between planets and other objects in the solar system



  • Provides a convenient scale for expressing space distances that are too large for kilometers but too small for light-years



The astronomical unit helps astronomers communicate and calculate orbits, planetary positions, and space missions with clarity and precision.



Handbreadth


A handbreadth is a traditional unit of length based on the width of a human hand, typically measured from the tip of the thumb to the tip of the little finger when the hand is fully extended. It was commonly used in ancient and medieval times for everyday measurements.



  • The handbreadth is generally about 3 to 4 inches (approximately 7.5 to 10 centimeters), though the exact length could vary by culture and era.



  • It served as a practical, easy-to-use measure in tailoring, construction, and daily life before standardized units were established.



  • The handbreadth is one of several body-based units, like the span and palm, reflecting how humans used their own bodies for measuring.



Summary:



  • About 3 to 4 inches (7.5 to 10 cm)



  • Based on the width of an extended hand



  • Used historically in various cultures



  • Practical for informal, everyday measurement



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