astro calc: object visibility across time (new tab or RTS tab)

[axd1967]

Is your feature request related to a problem? Please describe. I'd like to have an overview of when a selected object (and specifically a comet) is visible throughout time at a given location.

Describe the solution you'd like

A time/time diagram could represent this.

• X-axis is the time of day; preferably centred on midnight; number of columns is limited by screen resolution and user selected time step
• one row per day (down=increasing date)
• cells (or pixels) are colour coded (black=invisible; white=visible; shades of grey could mean altitude above the horizon) (with additional color codings for daylight and the different twilights).

This is related to the data shown in the RTS tab

[axd1967]

An alternative is to color-code the existing RTS tab: assign a background color to the R/T/S cells so that it becomes apparent which R/S events occur before/after SR/SS.

To digress: the RTS table could highlight the min/max altitude values.