Direct Measurement
At the base of the ladder are fundamental distance measurements, in which distances are determined directly, with no physical assumptions about the nature of the object in question. The precise measurement of stellar positions is part of the discipline of astrometry.
Read more about this topic: Cosmic Distance Ladder
Famous quotes containing the words direct and/or measurement:
“The charms of the passing woman are generally in direct proportion to the swiftness of her passing.”
—Marcel Proust (1871–1922)
“That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
—John Dos Passos (1896–1970)