By the UK Telescope Mounts – Expert Reviews & Buyer's Guides Team · Updated May 2026 · Independent, reader-supported

How to Polar Align Your Equatorial Mount: A Step-by-Step UK Guide

Polar alignment is the most important setup step for equatorial mounts. Get this right, and your telescope will track smoothly across the sky without field rotation. Get it wrong, and you'll waste time chasing objects and fail to capture clean long exposures for astrophotography.

The good news: you don't need expensive equipment. With patience and the right method for your circumstances, you can achieve alignment accurate enough for visual observing and widefield astrophotography in an evening. For deep-sky imaging requiring longer exposures, you'll want sub-arcminute accuracy, and that's where the methods diverge.

Why Polar Alignment Matters

An equatorial mount's whole purpose is to track stars by rotating around the polar axis—a line pointing directly at the celestial pole. If that axis doesn't point at the pole, your telescope will drift off target. The further north or south you slew, the worse the effect. Long exposures show field rotation and star trailing. Visual observers see objects drift out of the eyepiece.

Getting alignment right takes 15 minutes to an hour depending on your method and how accurately you need it. Skipping it, or doing it badly, costs you far more time later.

Drift Alignment: The Traditional Method

Drift alignment uses only an eyepiece and a star. No special software or tools needed. This makes it brilliant for pure visual observers, but it's slow and requires clear skies in multiple parts of the sky.

The principle is simple: if your polar axis points perfectly at the pole, a star on the celestial equator will stay centred in a powered telescope as you track it. Any drift north or south reveals mis-alignment. Drift east or west reveals mis-alignment in a different axis.

How to do it:

Find a star near the celestial equator (around the Orion Nebula region works well from the UK in winter). Use a high-power eyepiece—something like 150× magnification—so drift becomes obvious quickly. Track the star for 10 seconds. If it drifts south, your mount's polar axis is too far east. Adjust the altitude adjustment screws on your mount's head slightly and try again.

Once east-west drift is minimal, repeat the process with a star due east. This time, north-south drift tells you about altitude error (how far up or down the mount's axis is tilted from true north). Adjust accordingly.

The weakness: this method is finicky, takes multiple clear nights if conditions are poor, and requires good eyepieces. It's also not particularly accurate—you'll typically end up with 10–15 arcminute errors, fine for visual work but marginal for imaging.

Polaris Offset: A Quick Northern Method

Most of us observing from the UK never get a perfectly clear, drift-free southern horizon. The Polaris offset method exploits our location: Polaris, the North Star, sits just under 1 degree from the true north celestial pole.

What you need:

• A telescope with a 2° or wider field of view (many 50mm finders work; a wide eyepiece like a 25mm Plössl does too)
• Polaris, visible on any clear night in the UK

How to do it:

First, level your mount's base as well as you can with a spirit level. Point the telescope at Polaris. Using a reticle eyepiece, or by marking the field with tape, position Polaris at a specific offset position in your field of view. The exact position depends on the date and time—you'll find charts online, or some mount manuals include them.

The idea is that as Earth rotates, Polaris traces a small circle around the true pole. By keeping Polaris at a calculated offset position, your mount's axis aims at the pole's centre instead.

Accuracy: You can reasonably achieve 5–10 arcminute errors, good enough for most astrophotography. The method takes about 5 minutes and works any clear night. The main limitation is that it requires a reticle eyepiece and a chart; without those, you're guessing at position.

SharpCap Polar Alignment: Modern and Precise

If you have a dedicated astronomy camera or a decent planetary camera, SharpCap's polar alignment tool is arguably the easiest route to sub-arcminute accuracy.

SharpCap is free software. Its live view and polar alignment wizard let you see your mount's error in real time, then guide adjustments until your alignment is nearly perfect.

What you need:

• A camera connected to your telescope (or a telephoto lens on a DSLR)
• SharpCap installed on your computer
• Clear skies, at least a 1–2 degree field of view

The process:

Point your telescope roughly northward—don't worry about perfect Polaris alignment yet. Open SharpCap, start a live view, and let it locate Polaris automatically. The software displays Polaris's position relative to the true pole as a circle on your screen. Adjust the mount's altitude and azimuth screws until Polaris sits at the circle's centre. That's it—you're polar-aligned to better than 1 arcminute accuracy in most cases.

This method is genuinely quick (5–10 minutes), doesn't need eyepieces, and works regardless of your observing location. The only requirement is a camera and a computer. If you're already doing astrophotography, you'll have both.

Which Method Suits You?

For visual observing only, drift alignment is worth learning, though it's time-consuming. The Polaris offset method is faster and nearly as good.

If you're doing astrophotography—especially on mounts like the HEQ5 Pro or EQ6-R Pro—SharpCap polar alignment is the practical choice. It's fast, accurate, and works reliably. You'll spend more time capturing images and less time fighting tracking errors.

Most serious observers do SharpCap alignment before sessions, then check with a quick visual drift on their target to fine-tune. It's the best of both worlds: you start with software-guided precision, then verify and tweak by eye.

A Final Note

Even perfect polar alignment won't eliminate field rotation during a long exposure, but it'll minimise it. For widefield astrophotography, alignment accurate to a few arcminutes is usually sufficient. For narrow-field deep-sky imaging, aim for sub-arcminute accuracy—SharpCap gets you there reliably.

Take time on this step at the start of a session, and the rest of your night becomes vastly more enjoyable.