I wrote an Objective-C class that calculates the planetary hours for the current day and night based on the location of iPhone, iPad or Apple Watch, and adds those as events to the Calendar app on any MacOS or iOS device, as well as an app that displays the current planetary hour via a complication on the face of Apple Watch: The graphic circular and graphic corner complications, displaying the previous, current and upcoming planetary hours on the Apple Watch Series 4 Although the specific intent of the code is to supply a means for developers to add this data to their own apps, I've provided a few sample implementations showing the code at work: My Planetary Hour app for Apple Watch Series 4, as it appears in the Watch app for iOS Here's one for WatchOS: My Planetary Hour app, running in the WatchOS simulator The video below shows an example implementation of calendar events being added for each planetary hour in the Calendar app on iPhone using the class-
My inevitable demise, daily.