Iota Orionis

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Spacetime (Wikipedia) In physics, spacetime is a mathematical model that combines the three dimensions of space and one dimension of time into a single four-dimensional manifold. Spacetime diagrams can be used to visualize relativistic effects, such as why different observers perceive differently where and when events occur.

Na’ir al Saif (stars.astro.illinois.edu) NA’IR AL SAIF (Iota Orionis). Dangling from Orion’s Belt is the Hunter’s mighty three- star sword, the trio increasing in brightness toward the south.

Iota Orionis (Wikipedia) Iota Orionis (ι Orionis, abbreviated ι Ori) is a multiple star system in the equatorial constellation of Orion the hunter. It is the eighth-brightest member of Orion with an apparent visual magnitude of 2.77 and also the brightest member of the asterism known as Orion’s Sword. It is a member of the NGC 1980 open cluster. From parallax measurements, it is located at a distance of roughly 1,340 light-years (412 parsecs) from the Sun.