An astrophotographer Dylan O'Donnell captured a rare image of the International Space Station (ISS) while it was passing in front of the moon. It takes nearly 92.91 minutes for the ISS to complete one round of earth and it travels at a speed of 27,600 km per hour.

O'Donnell used a DSLR and telescope to capture the rare image. And to do this, he had to carefully time his photography to match the 33-second gap, the time that ISS takes to fly past the moon.

O'Donnell said, "I was at really ready to notice the shape along the ISS all over the cd of one's celestial satellite during the evening".

O'Donnell keeps on getting alerts from the Clasky website, which is a web-based astronomical calculator, about potential flyover of ISS over the moon.

It is said that the shutter speed was about 1/1650th of a second and ISO 800 in order to freeze the ISS in motion.

O'Donnell said in a statement that if anyone thinks that it was a matter of just sitting at a place with your camera and a clock, with one hand on the shutter release, you'd be absolutely correct.

The stunning image took nearly a year's time to capture and has created excitement among space enthusiasts throughout the world.

He timed the event using NASA's 'Spot The Station' application; further details are mentioned on his blog. And as O'Donnell knew exact seconds at which ISS would pass, he fired off a bust of exposure at the moment with his Canon 70D and Celestron 9.25-inch telescope.