A Night at Police Outpost


Milky Way in Twilight at Police Outpost Park

It was a perfect night at a dark site in southern Alberta. The Milky Way shone to the south and aurora danced to the north.

I had scouted out this location in June and marked it on my calendar to return in the fall when the centre of the Milky Way would be well-placed to the southwest.

The site is Police Outpost Provincial Park, named for the North West Mounted Police fort that once occupied the site, guarding Canada’s sovereignty in the late 1800s.

One result from the night of shooting is the opening image, the first frame from a time-lapse taken while deep blue twilight still coloured the sky. The main peak is Chief Mountain in Montana.

Twilight Aurora at Police Outpost
A fairly mild dispay of aurora in the darkening deep blue twilight over the lake at Police Outpost Provincial Park, in southern Alberta, on September 26, 2016, with the stars of Perseus rising, and with Capella low in the northeast at centre. This is a stack of 4 x 20 second exposures for the dark ground and water to smooth noise and one 20-second exposure for the sky, all with the 25mm Canon lens at f/2.8 and Canon 6D at ISO 2000. 

To the north an aurora display kicked up over the lake. While it never got very bright, it still provided a photogenic show over the still waters.

Aurora over Police Outpost Lake
A fairly mild dispay of aurora over the lake at Police Outpost Provincial Park, in southern Alberta, on September 26, 2016, with the stars of Auriga and Taurus rising, including the Pleiades at upper right. The Hyades in Taurus are the most prominent stellar reflections at lower right, in the still water this evening. Capella is the bright star above centre; Aldebaran is at right. This is a stack of 4 x 20 second exposures for the dark ground to smooth noise and one 20-second exposure for the sky and water, all with the 25mm Canon lens at f/2.2 and Canon 6D at ISO 3200. 

The waters were calm on this windless night (rare for southern Alberta), and so reflected the stars and Northern Lights beautifully.

Big Dipper Reflection
The Big Dipper reflected in the still waters of the lake at Police Outpost Provincial Park, in southern Alberta, on September 26, 2016, with an aurora to the north at right. Only in autumn can one shoot the Dipper reflected in the water in the evening sky, as it is then riding low along the northern horizon. This is from a latitude of 49° N where the Dipper is circumpolar. This is a stack of 4 x 25 second exposures for the dark ground to smooth noise and one 25-second exposure for the sky and water, all with the 25mm Canon lens at f/2.2 and Canon 6D at ISO 3200. 

Here, the Big Dipper reflects in the lake as we look north to the Lights. The movie below compiles still images and two time-lapse sequences, of the Lights and Milky Way. The sounds are the natural sounds I recorded on site, as flocks of geese were getting ready to migrate and the owls hooted.

Enjoy! — As always, for the best view, enlarge to full screen or click through to Vimeo with the V button.

— Alan, October 6, 2016 / © 2016 Alan Dyer / www.amazingsky.com

 

Driving into the Equinox Sun


At equinox the Sun sets due west and shines into the eyes of drivers heading west into the sunset.

This was the scene Friday night on Highway 1, heading to Banff out of Calgary. I set up beside the highway to catch the scene of the Sun going down at the end of the road. I was hoping for more smoke and haze to dim the Sun to a clearly defined disk rather than deal with a bright glow. But you shoot what the sky gives you.

This is one frame from a 315-frame time-lapse movie of the traffic madly moving down Highway 1 (a true to life recording!) and the Sun glow setting behind the Rockies.

– Alan, September 23, 2012 / © 2012 Alan Dyer

 

Right Angle Moon


Saturday night was a fine evening for witnessing the geometry of the night sky.

This is sunset on the evening of the autumnal equinox, September 22, 2012, with a first quarter Moon in the sky. The image illustrates the geometry of the quarter Moon’s position, which is always 90° away from the Sun, a quarter of the way around its orbit in its monthly cycle.

In this case, because the Sun (at right) was on the equinox position on the ecliptic, it was setting due west this night (something it does only on the dates of the fall or spring equinox). This put the quarter Moon (at left) 90° away, due south at sunset.

Draw a line from the Moon to your eye (the camera) and then back out to the Sun and it forms a 90° right angle. This geometry holds true for any quarter Moon, but being equinox the Sun and Moon were nicely aligned due west and south, making their right angle arrangement more obvious.

I took this shot from the grounds of the Rothney Astrophysical Observatory on the occasion of their monthly Open House.

– Alan, September 23, 2012 / © 2012 Alan Dyer