Although it’s barely been visible in the last couple of days, I noticed a tiny crescent moon peeking through the clouds on Sunday night in Sydney. Astronomy Picture of the Day has this great shot of both Venus and lunar crescents:

Picture of the moon and venus in crescent phase

Crescent Venus and Moon

I’ve heard a misunderstanding of the crescent moon that the roundedness is caused by the shadow of the earth. This isn’t actually the case – half the moon is always in shadow and the rounded shape we see is the result of the shadow being projected across the moon’s spherical surface and viewed on an angle from the earth. Wikipedia’s article on the phases of the moon has several explanatory diagrams.

Portrait of Matt Ryall

About Matt

I’m a technology nerd, husband and father of four, living in beautiful Sydney, Australia.

My passion is building software products that make the world a better place. For the last 15 years, I’ve led product teams at Atlassian to create collaboration tools.

I'm also a startup advisor and investor, with an interest in advancing the Australian space industry. You can read more about my work on my LinkedIn profile.

To contact me, please send an email or reply on Twitter.