[APBeta] Moonrise Time and Daylight Savings

Bruce Pipes bruce.pipes at fandm.edu
Mon May 3 07:58:47 PDT 2010


Paul,
I am checking this out right now - 10:50 am EST on 5/3/10. The moon info box shows a rise time of 12:27 am and a set time of 10:04 am. I am pretty sure that is when the moon rose last night and set this morning.
The graphic shows the moon rising a bit past 1:00 am, which I think is, indeed, the next moonrise.
I hope this is helpful.
Bruce Pipes

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.

Paul,

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
> 
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