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courses:ast201:4 [2023/11/08 21:09] – [2.2 Stellar parallax] asadcourses:ast201:4 [2023/11/08 21:10] (current) – [2.1 Astronomical Unit (AU)] asad
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 where $\Delta t$ is the time it takes for a radio signal to come back to earth after getting reflected from Venus. where $\Delta t$ is the time it takes for a radio signal to come back to earth after getting reflected from Venus.
  
 +==== - Distance ladder ==== 
 +{{:uv:distance-ladder.webp?nolink&600|}}
 ===== - Time ===== ===== - Time =====
 TAI: International Atomic Time defines 1 SI second as 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. Practical atomic clocks have a precision of about $2/10^{13}$. Two clocks located at two frames will have differing speed based on their relative velocities (special relativity) and their accelerations or local gravitational fields (general relativity). TAI: International Atomic Time defines 1 SI second as 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. Practical atomic clocks have a precision of about $2/10^{13}$. Two clocks located at two frames will have differing speed based on their relative velocities (special relativity) and their accelerations or local gravitational fields (general relativity).
courses/ast201/4.1699502970.txt.gz · Last modified: 2023/11/08 21:09 by asad
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