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Astronomical complex
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<p>An astronomical complex or commemorative astronomical complex is a series of man-made structures with an <a href="/facts/Astronomy/0ArJVM1p">astronomical</a> purpose. It has been used when referring to a group of <a href="/facts/Megalithic/wnyXzqda">Megalithic</a> structures that it is claimed show high precision astronomical alignments. For the study of <a href="/facts/Archaeoastronomy/6yE1gmmg">Archaeoastronomy</a>, such complexes of similar structures are required for adequate measurement and calculation to ensure that similar celestial sightlines were intended by the designers. These arrangements have also been known as observational, <a href="/facts/Ceremonial/c5NTgepr">ceremonial</a> or <a href="/facts/Ritual/EIJngpmf">ritual</a> complexes with importance for the study of prehistoric cultures. </p><p>The term has been used in the naming of various series of <a href="/facts/Observatories/y0FVg7vS">observatories</a> used for observing the stars in modern times. </p>