Dream world constellation time

The XZ time is not fixed every day, but it starts to brush at 20.

For example, XZ leaves at 7: 20 this evening, and will not brush at 8: 20 next time, and the next time may be 9: 20. Are inaccurate. Anyway, it is impossible to brush continuously at point X 20. Look at the time every day, and pay attention to the next time period without brushing at 20 o'clock last X. Hehe ~ there are many brands. lol ...