Editing Relativistic Doppler effect (section)

==== Receiver ''sees'' the source as being at its closest point ====
[[File:Transverse Doppler effect scenarios 4.svg|thumb|Figure 3. Transverse Doppler shift for the scenario where the receiver ''sees'' the source as being at its closest point.]]
This scenario is equivalent to the receiver looking at a direct right angle to the path of the source. The analysis of this scenario is best conducted from the frame of the receiver. Figure&nbsp;3 shows the receiver being illuminated by light from when the source was closest to the receiver, even though the source has moved on.<ref name=Morin/> Because the source's clock is time dilated as measured in the frame of the receiver, and because there is no longitudinal component of its motion, the light from the source, emitted from this closest point, is redshifted with frequency

{{NumBlk||<math display="block">f_r = \frac{f_s}{\gamma}</math>|{{EquationRef|4|Eq. 4}}}}

In the literature, most reports of transverse Doppler shift analyze the effect in terms of the receiver pointed at direct right angles to the path of the source, thus ''seeing'' the source as being at its closest point and observing a redshift.