In my twenties I went along to a spiritual growth weekend course - largely based on relaxing into an alpha state and using creative visualisation to learn, or to project a desired outcome. It was a positive experience, and I learnt about myself and the power of visualisation.
And, at the time I was also into astronomy, I had a nice 8inch Meade telescope, and often used it to view the Moon and planets and stars - even Halley's comet when it came past again in the 80s.
I liked to follow the movement of the planets, imagining their orbits and their distance from us. The two planets inside our orbit and thus never seen in the darkest hours - Mercury close to the sun, moving fast and rarely visible; Venus a little slower, a little further out and thus more visible, both the morning 'star' and the evening 'star', depending on it's position.
Then the outside planets which could be seen by naked eye even the darkest hours of the night - Mars, slightly red; Jupiter large and bright and slightly yellow/brown, Saturn less close, with the rings a wonderful sight in the 'scope . I got to know their orbits and movements fairly well over this period - and one night I had a wonderful experience of sight and understanding.
As I looked at several planets, the sun just having set - I saw it - I saw the solar system. I could see the sun was just below the horizon, I could see several planets and their relative distances, and their movement through their orbits. It all fit in my head, and I apprehended the whole solar (almost) system in my mind. It was a wonderful moment of seeing large.
And this moment of seeing large lead to one of the great experiences of my life in the alpha course shortly afterwards.
One of the exercises in this personal development weekend was to visualise one's consciousness growing larger and larger, to imagine one's 'self' was larger than merely the physical body we wear. First we imagined our consciousness expanding to fill the room - to be the room. Then to expand further and be the suburb, then be the city, then Australia, then the solar system. And it really 'clicked' for me - I surmise that the experience I had had in seeing the solar system was the trigger that made it work so well for me. It worked - I was the solar system. I went further, and I was the galaxy, then the whole universe. I had the experience of Cosmic Consciousness, one the sublimely great moments of this incarnation. My consciousness encompassed all of creation.
Afterwards, coming back to the room I was filled with energy and joy to such an extent I could not stop grinning with joy for a good hour or more - indeed my face ached from smiling so long.
Thank you Luc.