Critical Evaluation: Naphthalene with Cyclohexane (IUPAC SDS Volume 59)
Naphthalene solubilities in cyclohexane were retrieved from papers by Heric and Yeh (1), Choi et al. (2), Domanska (3), McLaughlin (4), Acree et al. (5), Heric and Posey (6) and Chang (7). The first four studies report solubilities at several temperatures, Acree et al. determined values at 303, 308 and 313 K, and the latter two studies measured the mole fraction solubility at a single temperature of 298 K. There is not a prior reason to exclude any of the seven studies from the critical evaluation.
Regressional analysis of the experimental data as Ln x1 versus 1/T yielded the following mathmatical relationship: Ln x1 = - 3916.1 (1/T) + 11.2291 (r=0.9984) for variation of naphthalene solubility with absolute temperature (see graph below).
References:

1 Heric, E. L; Yeh, K. N.; J. Chem. Eng. Data 1970, 15, 13-17.
2 Choi, P. B.; Williams, C. P.; Buehring, K. G.; McLaughlin, E.; J. Chem. Eng. Data 1985, 30, 403-409.
3 Domanska, U.; Pol. J. Chem. 1981, 55, 1715-1720.
4 McLaughlin, E.; Zainal, H. A.; J. Chem. Soc. 1960, 3854-3857.
5 Acree Jr., W. E.; Pontikos, N. M.; Judy, C. L.; Int. J. Pharm. 1986, 31, 225-230.
6 Heric, E. L.; Posey, C. D.; J. Chem. Eng. Data 1964, 9, 35-43.
7 Chang, W.; Ph.D Dissertation, North Dakota State University, ND, 1969.