English example sentences with "observational"

Brahe invented many instruments such as the Tyconian Quadrant which were widely copied and led to the invention of improved observational equipment.
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Greenhouse gas emissions from human activities are the only factors that can account for the observed warming over the last century; there are no credible alternative human or natural explanations supported by the observational evidence.
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I read the article "Exoplanet Biosignatures: Observational Prospects."
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The documentary is purely observational and critics say it avoids being didactic, helping to broaden its appeal.
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Goldberg cautioned that the Chinese study was observational, relying on information provided by the mothers many years after they had given birth, so the findings do not prove a cause-and-effect relationship. She said what's needed is a head-to-head comparison of women who breast-feed with a control group of those who don't, to see whether there are long-term heart-healthy benefits.
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