Calculating Time Delay
In a near-static gravitational field of moderate strength (say, of stars and planets, but not one of a black hole or close binary system of neutron stars) the effect may be considered as a special case of gravitational time dilation. According to special relativity, the speed of light is constant for measurements in a local reference frame. However, this is not true for non-local paths along which a gravitational field is present. The measured elapsed time of a light signal in a gravitational field is longer than it would be without the field, and for moderate strength near-static fields the difference is directly proportional to the classical gravitational potential, precisely as given by standard gravitational time dilation formulas.
Read more about this topic: Shapiro Delay
Famous quotes containing the words calculating, time and/or delay:
“Because relationships are a primary source of self-esteem for girls and women, daughters need to know they will not lose our love if they speak up for what they want to tell us how they feel about things. . . . Teaching girls to make specific requests, rather than being indirect and agreeable, will help them avoid the pitfalls of having to be manipulative and calculating to get what they want.”
—Jeanne Elium (20th century)
“There saw I how the secret felon wrought,
And treason labouring in the traitor’s thought,
And midwife Time the ripened plot to murder brought.”
—Geoffrey Chaucer (1340?–1400)
“To achieve the larger goal of teaching her children consideration of others, a mother can tolerate some frustration of her own wishes, she can delay having what she wants, she can be flexible enough to compromise. And this is exactly what her child must also learn: that it is possible to survive frustration, it is possible to wait for what he wants, it is possible to compromise without capitulating.”
—Elaine Heffner (20th century)