How can I setup a schedule for exact minute of every hour?

I have setup a raspberry pi for read temperature and humidity from sensor and I would like it to publish those data to a MQTT broker at 00,15,30,45 minute of every hour, like weather report of observatory . How can I setup this schedule?

I have setup a schedule like this: `schedule.every(15).minutes.do(read_n_publish)` but it can only run the job every 15 minute from the time I start run the program.