= Solution
Three signatures are \b[a displaced <exoplanet thermal phase curve> maximum, the day-night temperature contrast, and wind-induced Doppler shifts].
The maximum of an <exoplanet thermal phase curve> need not coincide with secondary eclipse. An eastward hot spot and a maximum before eclipse indicate eastward advection/<atmospheric superrotation>, provided reflected light and <exoplanet clouds> are accounted for.
The amplitude and shape of an <exoplanet thermal phase curve> measure <day-night heat redistribution>: a warm nightside and reduced day-night contrast imply effective transport relative to <radiative relaxation time in a planetary atmosphere>. Wavelength-dependent contrasts can reveal different circulation efficiencies at different contribution pressures.
High-resolution transmission or emission spectra can show line-centroid shifts/broadening relative to the orbital velocity. A limb blueshift is consistent with a dayside-to-nightside flow toward the observer; rotation and limb asymmetry affect the pattern. Such <Doppler spectroscopy> probes velocity directly, while phase curves probe the transported temperature pattern.
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