An Astronomer in Love is a dual-timeline, slow-burn literary fiction that’s part historical expedition adventure and part whimsical love story. If you haven’t read any of Antoine Laurain’s books, this one is a perfect introduction—short, full of charm, and full of the author’s signature whimsical French realism. Like all of Laurain’s novels, it was originally written in French and beautifully translated into English. Beneath its lighthearted surface, the story explores themes of fate, destiny, and the mystical feeling of being drawn to someone as if you’ve known them in another life!

In the 18th-century historical timeline, the story follows Guillaume le Gentil, a real-life French astronomer commissioned by King Louis XV to record the rare transit of Venus—a celestial event that happens only once in a lifetime. Guillaume’s expedition to the Indian Ocean quickly turns into a perilous journey: he battles storms, war, shipwreck, illness, and isolation across India and the Philippines. In the modern 2012 timeline, Xavier Lemercier, a lonely divorced estate agent and single father, discovers Guillaume’s old telescope. Peering across Paris rooftops, he spots a woman he’s inexplicably drawn to—who even has a zebra in her apartment! When she later walks into his office, Xavier’s life and heart take an unexpected turn.

The story follows two very different men, each shaped by a shared longing. Guillaume starts out as a serious, dutiful man, completely focused on observing the Transit of Venus after years of scientific research and working for the monarchy. But his journey quickly becomes unpredictable—storms, war, and isolation force him to question not just his mission, but what really matters in life: connection and loss. Xavier, on the other hand, is struggling in his own way—he’s divorced, dealing with a tense relationship with his ex, the housing market is hurting his income, and he feels lost. His fascination with the woman he spots through the telescope quickly grows into obsession and a yearning for connection. Their chance encounter and the friendship that grows feel almost fated, with lots of meaningful, heartfelt dialogue. Their children form an instant bond too, making it feel like a match made in heaven—until unspoken truths surface. As the timelines shift back and forth, even though lives never cross, their journeys mirror each other—Guillaume learns he can’t control everything, and Xavier realizes sometimes you just have to let go.

This is a short book—just 256 pages—and it’s easy to finish in one sitting. The pacing is steady, and the immersive writing draws you right into both Guillaume’s historical adventure and Xavier’s modern Paris love story. The historical sections are especially vivid, from Guillaume’s time at sea with the captain and crew during storms to the charming shipboard camaraderie. In both timelines, the ending doesn’t wrap everything up neatly. For Guillaume’s, it’s a bittersweet, poetic ending that makes you want to look up the historical facts to see how much of his story matches reality. For Xavier, there’s no guaranteed happily-ever-after, but there’s a sense of hope and reflection—much more realistic than a conventional HEA romance, and perfectly in line with Laurain’s style!

Overall, An Astronomer in Love beautifully combines serendipitous romance, linked destinies, and whimsical storytelling. Fans of historical/modern dual timelines, Parisian settings, expedition adventure stories, and literary romances that feel like they were written in the stars will find a lot to love in this book!