“I had a dinner with Pharrell and his wife a few months later, and I said, ‘Neil deGrasse Tyson was nice to me.’ Pharrell said, ‘No he wasn’t! He gave you a hard time on Mercury retrograde, and I won’t let him live it down.’ I said, ‘Oh Pharrell, he was O.K. He was nice to me. I was scared but he was respectful,’” Ms. Miller says. (A rep for Mr. Williams confirmed the story: “He loves her.”)

Whether you believe in her methods or not, though, Ms. Miller is devoted to providing advice for you and the other millions of readers who visit her site when she distributes her free horoscopes, usually on the first of the month. To supplement her income, she offers even longer forecasts for what she says is about half a million paying app subscribers, writes regular columns for a handful of magazines including Vogue Japan and has a partnership in the works with her favorite hotel, the Four Seasons Los Angeles in Beverly Hills.

Here it is necessary to address the situation surrounding Ms. Miller’s forecasts, which is that they are often published days, and sometimes weeks, past her self-imposed deadlines, and often without a satisfying explanation. One summer, a particularly late July column made tabloid headlines replete with quotes from her readers, who found themselves incapacitated from having to start the month off blind.

Her fans know from reading about her over the years that these delays are usually related to unforeseeable flare-ups from chronic illnesses she says have plagued her since she was left bedridden for a year with a rare disease at the age of 14. Since then, she says, she’s undergone dozens of surgeries, and been in and out of the E.R. with broken bones, recurring infections and symptoms of muscular degeneration. Her eyesight is failing, and she says that earlier on the day we spoke she took a breath test for the gastrointestinal disease ulcerative colitis. Or maybe the breath test took place four years ago. Like Ms. Miller’s forecasts, her medical history does not follow a strict linear narrative, and she breaks off on tangents and circles back many times. All you really need to know is that she’s sick quite a lot, and so sometimes, she says, she takes longer to write than she anticipated.

Ms. Miller’s mother taught her the art of astrology while she was bedridden as a teen. She also accurately predicted her daughter’s career trajectory.