Toddlers in the PFR condition showed a significant decrease in their separation distress scores, and toddlers
exhibiting less separation distress had fewer sleep problems.
From the perspective of an observer on Earth, the orbit of Star A and the BC tight binary pair
exhibit a very elongated and narrow ellipse whose
separation has varied from 4.7» in 1880 to
less than 0.4» in 1969 (Kaj Aage Gunnar Strand, 1937; A. Gennaro, 1940; L. Bennendijk, 1955; Worley and Heintz, 1983; and Wulff Dieter Heintz, 1963 to 1997; among others).