Article to be published in the Journal of the AAVSO.
We present an updated O-C diagram of the light time variations of the 5.99857 day period eclipsing binary in this system as it moves in the long period orbit of the two pairs. This includes new Variable Stars South members’ measures from 2017 to 2019, BRITE satellite observations in 2017 and 2018 and 100 previously unknown measures made at Auckland Observatory from 1974 to 1978. Measures in 2017-19 indicate a rather longer primary total eclipse period of 0.295 +/- 0.02 days (7.08 +/- 0.48 hours) than the earlier models. We conclude that QZ Carinae has not yet completed one orbit of the two pairs since discovery in 1971. Other observational features include the duration and shape of primary and secondary eclipses and small scale short term brightness changes.