[APBeta] Moonrise Time and Daylight Savings

[Paul Rodman]

On May 2, 2010, at 11:37 AM, Bruce Pipes wrote:

> I think I have found a way to see this problem. With the Objects window open, go to the Date/Time box and click on the date, so you can change it. Then click on the up and down arrow to move the date back and forth. I am finding that the moon rising time shown in the Moon box and on the graphic display do not track together.
> 
> Bruce Pipes
> 
> On May 2, 2010, at 1:06 PM, Paul Rodman wrote:
> 
>> I'll see if I can reproduce this.
>> 
>> Paul R.
>> 
>> On Apr 30, 2010, at 9:00 PM, Sean McGivern wrote:
>> 
>>> Hi all.
>>> 
>>> I'm not sure if this is a feature I don't understand, but the moonrise calculations shown on the normal view do not appear to honor daylight savings time.  My GMT Offset shows DST, and the sunset/twilight panel does appear to honor it.
>>> 
>>> For example, on 4/30/10, moonrise should be around 10:50 PM, but my screen shows 11:42 PM.  The short-term visibility indicator shows moonrise before 11 PM, and the Darkness Calendar script shows Moon Rise at 10:48 PM.
>>> 
>>> After a bit more reflection, it seems likely that I am misunderstanding which day it shows; Darkness Calendar shows 11:42 PM for May 1 (tomorrow night as I write this at 11:55 PM on 4/30).  However, it was showing the same thing at around 8 PM on 4/30, well before the moon rose.
>>> 
>>> Can anyone offer an explanation?
>>> 
>>> Thanks.
>>> 
>>> Sean McGivern

The problem is that those rise/set times depend on the current local time.

If you add a Moon object to your plan, the rise/transit/set times are for the current local day.
The rise and set times in the Moon info at the top of the screen is for the next rise/set time, and that depends on the current local time of day.

There do appear to be some anomalies in the short- and long-term visibility indicators though. I will investigate these.

Paul R.