Hi all,

Just a question to clarify how to get accurate rise/set times.

If I want the horizon blue line in guide to represent the "observer's horizontal plane" I must set the altitude in guide to 0m even if the observer is on a plateau at 1000m height ?

Is this correct ?

Luc

--- In guide-user@yahoogroups.com, Bill J Gray <pluto@...> wrote:
>
> Hi Arild,
>
> Yup, it's refraction plus altitude. The "ground" is dropped for
> both effects (set a ridiculously high altitude such as 10000 km,
> for example, and you'll see the "ground" drop to cover a 46-degree
> circle at the nadir.) This helps ensure that the rise/set times
> match the times the objects actually reach the horizon.
>
> -- Bill
>