Digital Sidereal Clock
- Flyhigh7
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Digital Sidereal Clock
I just think it would be a neat tool for planning the observing sessions and if for nothing else a unique item. Call me lazy or crazy but I think it would be neat to look at during the day when the stars are not out to see what the Sidereal time is. I'm trying to memorize the constellations and the brightest stars with respect to their location to Sidereal time. Then I'll try to memorize the brightest Deep Space objects. I figure if i can do this, I can have a star map in my head.
I admire you guys who have been doing this for a long time and already have a fairly detailed star map in your head.
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Re: Digital Sidereal Clock
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- Flyhigh7
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Re: Digital Sidereal Clock
Thanks. That's a good idea however I am not bringing this Telescope out while the sun is up until I get a sun filter. Last time the WiFi hung it wouldn't stop slewing until I found the power OFF button. LOL I just don't trust this system yet. Didn't get to go out yesterday due to clouds with 25mph winds. I hope to do that tonight.
Also,I removed the Focus motor because I don't like having to scroll through a few menus to make focus adjustments. If they ever have dedicated Focus IN and Focus OUT buttons, I'll put it back on. I was able to stay connected to SkyPortal (indoors) while not aligned for 30 minutes without a problem so I'm hoping for some good WiFi performance outdoors if I get some clear skies tonight.
I still like your idea to negotiate the updated WiFi Head.
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
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Re: Digital Sidereal Clock
There are very few motorized focusers that are visual friendly. You really only need the motor if you are imaging and not near the scope or don't want to vibrate the system while tuning focuing.
For visual, nothing beats the old manual method.
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Re: Digital Sidereal Clock
A sidereal day is 23 h 56 min 4.0905s
The difference between siderial time and mean solar time is a factor of 1.00273791.
Some old digital watches and clocks 1980's and 90's had a small potentiometer that could be tweaked to change the rate. The idea being you could tweak it to get perfect solar time. But you could also tweak to get sidereal time. Had to be a battery clock. Plug in electrics work off the frequency of the mains.
A simple way to work out approximate sidereal time in your head, which for the purpose you are stating of wanting to know roughly what is overhead should be good enough, is that sidereal time is 0
That rough method will usually get you reasonably close(5-10mins) of true sidereal time
So for example, today Feb 23 at 2:24 pm the sidereal time is
Since September 23(last Autumnal equinox)
5 months x 2 hrs.
+ 0 weeks x 30 mins
+ 0 days x 4mins
10hrs 0m
subtract longitude correction
10:08-00:08=10:00
add Local time 14:24
total 24hrs24m
Sidereal time 00hrs 24m (Calculated from above)
Sidereal time 00hrs 28m (Obtained by precise calculation)
__________________________________________________________________
Today being exactly 5 months was a particularly easy example.
Let's try March 5th at 11:42am
Since September 23(last Autumnal equinox)
5 months x 2 hrs.
+ 1 week x 30 mins
+ 4 days x 4mins
10hrs 46m
subtract longitude correction
10:46-00:08=10:38
add Local time 11:42
total 22hrs 20m
Sidereal time 22hrs 20m (Calculated from above)
Sidereal time 22hrs 29m (Obtained by precise calculation)
There are apps for Android and IOS that will spit out sidereal time. You can set a regular clock off the
Joe
Amateur astronomer since 1978...................Web site : http://joe-cali.com/
Scopes: ATM 18" Dob, Vixen VC200L, ATM 6"f7, Stellarvue 102ED, Saxon ED80, WO M70 ED, Orion 102 Maksutov, ST80.
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Re: Digital Sidereal Clock
Interestingly, because the
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- Flyhigh7
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Re: Digital Sidereal Clock
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
EPs: Baader Hyperion Aspheric 36mm 1.25"/2", Pentax XW 20mm, Pentax XW 7mm,
Tele Vue Delite 11mm, Plossl 40mm & 13mm
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Re: Digital Sidereal Clock
Here's a link: https://play.google.com/store/apps/deta ... nightshift
Cheers,
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- Flyhigh7
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Re: Digital Sidereal Clock
Thanks JayTee. This looks like an excellent
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
EPs: Baader Hyperion Aspheric 36mm 1.25"/2", Pentax XW 20mm, Pentax XW 7mm,
Tele Vue Delite 11mm, Plossl 40mm & 13mm
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Re: Digital Sidereal Clock
Apple Store has an
Joe
Amateur astronomer since 1978...................Web site : http://joe-cali.com/
Scopes: ATM 18" Dob, Vixen VC200L, ATM 6"f7, Stellarvue 102ED, Saxon ED80, WO M70 ED, Orion 102 Maksutov, ST80.
Mounts: Takahashi EM-200, iOptron iEQ45, Push dobsonian with Nexus DSC, three homemade EQ's.
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- Flyhigh7
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Re: Digital Sidereal Clock
Thanks Joe. I'm currently upgrading my IOS to 15 to get this clock.
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
EPs: Baader Hyperion Aspheric 36mm 1.25"/2", Pentax XW 20mm, Pentax XW 7mm,
Tele Vue Delite 11mm, Plossl 40mm & 13mm
Barlow Lens: Tele Vue 2.5x - 1.25" Powermate
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Re: Digital Sidereal Clock
∞ AP Scopes: #1: TPO 6" f/9 RC #2: ES 102 f/7 APO #3: ES 80mm f/6 APO
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- Flyhigh7
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Re: Digital Sidereal Clock
I had used up all my fast download time so it took 2 days to download the ios upgrade I needed for LST Clock but that is finally done and I have this cool little
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
EPs: Baader Hyperion Aspheric 36mm 1.25"/2", Pentax XW 20mm, Pentax XW 7mm,
Tele Vue Delite 11mm, Plossl 40mm & 13mm
Barlow Lens: Tele Vue 2.5x - 1.25" Powermate
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Re: Digital Sidereal Clock
Glad that works for you. After that post, I created an excel spreadsheet that worked out LST to within a few minutes accuracy. The mental arithmetic method I described was how I did it back in the 80’s before smart phones and laptop computers.Flyhigh7 wrote: ↑Mon Feb 26, 2024 2:19 pmI had used up all my fast download time so it took 2 days to download the ios upgrade I needed for LST Clock but that is finally done and I have this cool littleapp now. Thanks for the tip Joe. I like that you can have multiple locations (not that I'm ready to start lugging this beast of a telescope around).
Joe
Amateur astronomer since 1978...................Web site : http://joe-cali.com/
Scopes: ATM 18" Dob, Vixen VC200L, ATM 6"f7, Stellarvue 102ED, Saxon ED80, WO M70 ED, Orion 102 Maksutov, ST80.
Mounts: Takahashi EM-200, iOptron iEQ45, Push dobsonian with Nexus DSC, three homemade EQ's.
Eyepieces: TV Naglers 31, 17, 12, 7; Denkmeier D21 & D14; Pentax XW10, XW5, Unitron 40mm Kellner, Meade Or 25,12
Cameras : Pentax K1, K5, K01, K10D / VIDEO CAMS : TacosBD, Lihmsec.
Cam/guider/controllers: Lacerta MGEN 3, SW Synguider, Simulation Curriculum SkyFi 3+Sky safari
Memberships Astronomical Association of Queensland; RASNZ Occultations Section; Single Exposure Milky Way Facebook Group (Moderator) (12k members), The Sky Searchers (moderator)
- Flyhigh7
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Re: Digital Sidereal Clock
Don't ya just love Excel!. I used to use Visual Basic to program Excel to produce my companies' Operations Failure Rate and Expense Tracking reports. VBA for Excel is fun!
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
EPs: Baader Hyperion Aspheric 36mm 1.25"/2", Pentax XW 20mm, Pentax XW 7mm,
Tele Vue Delite 11mm, Plossl 40mm & 13mm
Barlow Lens: Tele Vue 2.5x - 1.25" Powermate
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- Flyhigh7
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Re: Digital Sidereal Clock
I am very impressed with Celestron Tech support as they have been very responsive to me in a timely manner and they know what they are doing. When you call Celestron support you actually get Technicians that work at and for Celestron instead of some third party company located on the other end of the world. I'm happy to report they are honoring my request to send me a WiFi Module which should have a stronger WiFi radio in it than the one in my mount. I have clouds in my area for the next few days so I won't be hunting stuff soon but I thank you all for your help.
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
EPs: Baader Hyperion Aspheric 36mm 1.25"/2", Pentax XW 20mm, Pentax XW 7mm,
Tele Vue Delite 11mm, Plossl 40mm & 13mm
Barlow Lens: Tele Vue 2.5x - 1.25" Powermate
Filters: Baader Planetarium Neodymium Moon & Skyglow Filter
- OzEclipse
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Re: Digital Sidereal Clock
Well, if you love excel, FWIW, here is the excel spreadsheet. It's not fancy, just something I threw together after I answered your first post to see if I could remember how to do it without a reference. You need to enter the date of the previous autumnal equinox.
Cheers
Joe
Amateur astronomer since 1978...................Web site : http://joe-cali.com/
Scopes: ATM 18" Dob, Vixen VC200L, ATM 6"f7, Stellarvue 102ED, Saxon ED80, WO M70 ED, Orion 102 Maksutov, ST80.
Mounts: Takahashi EM-200, iOptron iEQ45, Push dobsonian with Nexus DSC, three homemade EQ's.
Eyepieces: TV Naglers 31, 17, 12, 7; Denkmeier D21 & D14; Pentax XW10, XW5, Unitron 40mm Kellner, Meade Or 25,12
Cameras : Pentax K1, K5, K01, K10D / VIDEO CAMS : TacosBD, Lihmsec.
Cam/guider/controllers: Lacerta MGEN 3, SW Synguider, Simulation Curriculum SkyFi 3+Sky safari
Memberships Astronomical Association of Queensland; RASNZ Occultations Section; Single Exposure Milky Way Facebook Group (Moderator) (12k members), The Sky Searchers (moderator)
- Flyhigh7
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Re: Digital Sidereal Clock
Telescope: Celestron Evolution 9.25 with Celestron Motor Focus
Evolution WiFi Mount Head/ built in 10 Hr Battery and CPC Tripod
Binoculars: Celestron SkyMaster Giant 15x70 / Heavy Duty Tripod
Orion 2x54 Ultra Wide Field
Camera: Canon Digital Rebel XT EOS 350D
Diagonal: Baader 2" BBHS Sitall Mirror
EPs: Baader Hyperion Aspheric 36mm 1.25"/2", Pentax XW 20mm, Pentax XW 7mm,
Tele Vue Delite 11mm, Plossl 40mm & 13mm
Barlow Lens: Tele Vue 2.5x - 1.25" Powermate
Filters: Baader Planetarium Neodymium Moon & Skyglow Filter
- billywjackson
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Re: Digital Sidereal Clock
Clear skies!
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Re: Digital Sidereal Clock
billywjackson wrote: ↑Thu Apr 04, 2024 8:38 pm This doesn't help the IOS people, but there is an app for android called Astro Clock. Gives local. true solar, and sidereal times. Also sun, moo , and planet info.
Clear skies!
Cheers for that.
Graeme
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