... Mira also known as Omicron Ceti (ο Ceti, ο Cet), is a red giant star estimated 200-400 light years away in the constellation Cetus. Mira is a binary star, consisting of the red giant Mira A along with Mira B. Mira A is also an oscillating variable star and was the first non-supernova variable star discovered, with the possible exception of Algol. Apart from the unusual Eta Carinae, Mira is the brightest periodic variable in the sky that is not visible to the naked eye for part of its cycle ...

In 1638 Johannes Holwarda determined a period of the star's reappearances, eleven months; he is often credited with the discovery of Mira's variability. Johannes Hevelius was observing it at the same time and named it 'Mira' (meaning 'wonderful' or 'astonishing,' in Latin) in 1662's Historiola Mirae Stellae, for it acted like no other known star. Ismail Bouillaud then estimated its period at 333 days, less than one day off the modern value of 332 days, and perfectly forgivable, as Mira is known to vary slightly in period, and may even be slowly changing over time ...

It would be reasonable for a star observer to document such special stars firmly on his 'map'. My astronomy book has no star rising heliacally in the 4 days beyond Mira (nor in the preceding 2 nights). 2 + 1 + 4 = 7.