[guide-user] Selective Satellites

[Paul Schlyter]

"Without knowing the full vagaries of the time zone at Pisa in 1612" -- 
time zones were not used in 1612, they were introduced much later, in 
the 1800's to 1900's. Back in 1612 local solar time was used everywhere. 
Either mean solar time or perhaps even true solar time. This was good 
enough back then, when the fastest available transportation was by 
horseback on land or by sailing ship at sea.

Paul Schlyter, Stockholm


Den 2020-04-27 kl. 16:47, skrev Kenneth Drake:
> Here is what I've been able to simulate using Guide 9.1. Without 
> knowing the full vagaries of the time zone at Pisa in 1612, I used 
> what I could knowing what it is today. I had to assume that Galileo 
> would observe Jupiter when crossing the meridian which I find to be 
> around 4UT and 50 degrees up. To get the simulation to approximate his 
> notes, I had to believe that his drawing was made in the middle of 
> Nautical twilight - 06:50 Central European Time. Jupiter up 45 
> degrees. A direct link to my image is here if it does not come up in 
> the forum.
>
> https://i.imgur.com/PCvFshQ.jpg
>
> Kenneth Drake  Willis, Texas
>
> On 4/25/2020 2:27 PM, Kenneth Drake wrote:
>> Thanks. That worked great. I was simulating the configuration of the 
>> Jovian moons when Galileo made several observations of Jupiter in 
>> 1612 and 1613. I found some of his notes and Guide 9.1 does a really 
>> nice job of displaying the positions marked by Galileo over the month 
>> long period. He saw Neptune also and there is a lot of controversy 
>> about some of his notes. Thanks for a great product.
>>
>> Kenneth
>>
>> On 4/25/2020 1:26 PM, Bill Gray wrote:
>>> Hi Kenneth,
>>>
>>>    The setting you tried would only adjust artificial
>>> earth satellites.
>>>
>>>    In that same Display/Data Shown dialog,  set planet
>>> magnitudes to be 'fixed' (i.e.,  not varying with zoom
>>> level) and set the limiting magnitude to,  say,  10.
>>> After the Galileans,  the next brightest satellite of
>>> Jupiter is somewhere around 16.  You'll suppress everything
>>> except the Galileans.
>>>
>>> -- Bill
>>>
>>> On 4/25/20 2:16 PM, Kenneth Drake wrote:
>>>> Is there a way to selectively only show the Galilean Moons and none 
>>>> of the other satellites of the planets? I tried Display/Data 
>>>> Shown/Satellites but has no effect.
>>>>
>>>> Kenneth Drake  Willis, Texas
>>>>
>>>>
>>>
>>
>
-- 
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Paul Schlyter,  Grev Turegatan 40,  SE-114 38 Stockholm,  SWEDEN
e-mail:  pausch at stjarnhimlen dot se
WWW:     http://www.stjarnhimlen.se/