Dr. Marcy and Dr. Butler made the detections by observing variations in the light from the stars.

Simply by observing variations in how long it takes to perform cryptographic operations, it might be possible to determine the entire secret key.

In 1911 Domenico Pacini observed simultaneous variations of the rate of ionization over a lake, over the sea, and at a depth of 3 meters from the surface.

Pacini observed simultaneous variations of the rate of ionization on mountains, over a lake, over the sea, and underwater.

Transit Timing Variation is a method for detecting exoplanets by observing variations in the timing of a transit.

The Italian astronomer Geminiano Montanari recorded observing variations in luminosity of the star Algol in 1667.

Replication of the field measurements Observed variations of CO2 in the atmosphere.

The series stays true to the US version, albeit observing certain cultural variations on the format.

It is possible to observe significant variations in monthly production.

That allowed them to observe variations in temperature and other properties extending over several miles, potentially allowing them to identify interesting regions to focus on.