SingAstro

Simplified diagrams for better visualizations

I get what you meant, thanks for info.

It is at least theoretically possible since it is 2.08 deg in Altitude during transit, ie. when Local sidereal time (LST) = Star's Right Ascension (RA)

Here is another retro plate solve, this round is M16 Eagle nebula, taken at 09 Aug 2012. Meade 80/480 ED APO, Canon 500D ISO 800, 70s X22, at SG. Rotated & Cropped https://live.staticflickr.com/65535/53893933977_086bda981f_k.jpg Original framing https://live.staticflickr.com/65535/53893933942_66...

Current weather condition limits one's astro activities to re-processing pass data. Found this Helix Nebula taken 31 Aug 2013 from hard disk. Captured at Bedok South, with TS-65/420 Scope, Canon 500D mod. Re-adjusted Level and Curve - looks brighter now and covered up most of the Noise. Retro Plates...

Well done Bernard, 3 mins un- guided at mid focal length is remarkable.

It is quite intuitive to practicing imagers that Bortle class do vary over our small island. (Refer rifleman175's A Method of Determining the Bortle Class at my Observation Site), i do agree with rifleman's finding that "the light pollution at Senkang is around Bortle 7.0 at altitude of 55 degr...

Bernard, very nice images, awesome and motivational

Hi Bernard & cytan, yes indeed it is possible to do AP with just partially clear sky. (We can't image the whole sky all at one go anyway, unless using fish eye lens) so at worse, some subs may be discarded if found to be affected by the changing sky condition. cytan's Astro Physics Skymodelling ...

Thank you