Mars is one of the most rewarding planets to observe, but it is also one of the most frustrating. On most nights it looks like a small orange disc, and beginners often wonder what they are doing wrong. Usually the answer is timing, magnification, or both.

The key fact about Mars is its orbit. Mars comes to opposition roughly every two years and two months, when Earth passes between Mars and the Sun. Around opposition Mars is closest to Earth, rises at sunset, and shines at its brightest — and that window of a few months is when surface detail is actually visible.

A small telescope of 70 to 90 millimetres can show Mars as a clear disc and reveal a bright polar cap. To see dark markings such as Syrtis Major, you generally need 100 to 200 millimetres of aperture and magnifications of 150x or more, plus steady air.

Color filters make a real difference on Mars. An orange or light red filter darkens the dark plains and boosts contrast, while a light blue filter makes the polar caps and hazes stand out. Filters are cheap, and they are the single easiest upgrade for Mars observing.

On a good night, look for the white polar cap first, then the dark triangular shape of Syrtis Major rotating into view over several nights. Sketching what you see, even roughly, trains your eye far faster than staring alone.

Be patient with the atmosphere. Moments of steady air come and go within seconds, and the sharpest detail often appears in brief flashes. Observe for at least half an hour, let your telescope cool to outdoor temperature, and avoid observing over rooftops or warm pavement.

Keep an observing log and it will repay you quickly. Note the date, time, telescope, eyepiece, filter, and a rough sketch of what you saw, plus a simple seeing rating out of five. Over a few weeks the log reveals patterns you would otherwise miss: which filters work best for your telescope, which nights gave the sharpest views, and how the dark markings shift as Mars rotates. It also stops you repeating mistakes, like observing too early before the telescope has cooled. A planetarium program or printed Mars chart can tell you which hemisphere faces Earth on a given night, so you can plan sessions for the nights when Syrtis Major or a polar cap is best placed.