Gravitational Lensing Q: Angle Deflection Sun/Earth?

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Discussion Overview

The discussion centers on the concept of gravitational lensing, specifically regarding the angle of deflection of light as it passes near the sun. Participants explore whether the stated angle of 1.75 arcseconds refers to the deflection occurring near the sun or the angle measured upon reception on Earth.

Discussion Character

  • Exploratory, Conceptual clarification

Main Points Raised

  • One participant questions whether the angle of deflection of 1.75 arcseconds is measured as the light passes the sun or when it reaches Earth.
  • Another participant suggests a resource that might contain the answer to the question posed.
  • A different participant expresses that they could not find the answer in the suggested resource but acknowledges its informative nature.
  • One participant clarifies that the angle is defined relative to an undeflected ray, implying it is consistent everywhere.
  • A later reply acknowledges a misunderstanding and expresses a casual apology for the confusion.

Areas of Agreement / Disagreement

The discussion remains unresolved regarding the specific interpretation of the angle of deflection, with some participants clarifying concepts while others express confusion.

Contextual Notes

There is a lack of consensus on the precise definition of the angle of deflection in relation to the observer's perspective and the conditions under which it is measured.

Macrobe
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I have a simple question about gravitational lensing around our sun: is the angle of deflection 1.75" arcseconds the angle of deflection as the light goes past the sun, or the angle of deflection when it is received here on earth?
 
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I can't find it on that, though it is an interesting read. Very informative.
 
Macrobe said:
I can't find it on that, though it is an interesting read. Very informative.
I don't understand your question. The angle is defined relative to an undeflected ray, so it is the same angle everywhere.
 
Oh...yeah...duh. If you'll pardon the colloquialism, I had a brain fart. My apologies.
 

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