Astronomical twilight is the darkest phase of twilight that a viewer sees before the last refracted sunlight leaves the horizon. It usually occurs twice a day. Source Share: Previous Post Germany: The Plug-In Car Sales Decrease Deepened In April 2022 Next Post Best lights that support Google Assistant 2022 Related Articles Space This Star Wars: The Black Series Darth Vader figure is 15% off at Amazon Space Space-based solar power may be one step closer to reality, thanks to this key test (video) Space Boeing’s next Starliner test launch for NASA slips to 2022 Space Can a private space mission pierce Venus’s clouds? Space Why March is the best month to see the northern lights Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. × 3 = fifteen