Terms of service

Last updated: 30 October 2026

In short: Asteria is free to use. A supporter membership is a yearly paid membership with extra features; it renews every year until you stop it, which you can do at any time. Payments are handled by our online reseller Paddle. You can get a full refund within 14 days of any payment.

1. Who we are

Asteria (asteria.waddensky.com) is a stargazing assistant and web planetarium made by Waddensky ("we", "us"). Company details and contact: use the contact form on www.waddensky.com. These terms apply when you use Asteria and when you become an Asteria supporter.

2. Using Asteria

Asteria is free to use, with or without an account. You can create an account with your Google account or with an email address and password, and delete it at any time from within Asteria.
Keep your sign-in details to yourself; you are responsible for what happens with your account. Use Asteria only lawfully, and don't try to disrupt it, break its security or overload our servers.
How we handle your personal data is described in our privacy policy.

3. Astronomical information and forecasts

Asteria calculates the sky, and shows weather and sky-brightness data from third parties. We take care to make this accurate, but calculations, forecasts and other data can be wrong or unavailable, and Asteria is not suitable for navigation or safety decisions. Never look at the Sun, including during an eclipse, without proper solar filters.

4. Supporter memberships

Our order process is conducted by our online reseller Paddle.com. Paddle.com is the Merchant of Record for all our orders. Paddle provides all customer service inquiries and handles returns. When you buy a membership, Paddle's buyer terms also apply to the purchase.

What it is: a supporter membership gives your Asteria account extra features for as long as it is paid for. The tiers (Lunar and Solar) and what each includes are shown on the supporter page and in Asteria.
Price: you choose one of the amounts offered, shown per month and charged once a year: at least €12 per year (Lunar) or €24 per year (Solar). Prices are in euros and include VAT or sales tax.
Yearly renewal: unless you buy a single year, your membership renews automatically every year, and the yearly amount is charged to your payment method at the start of each new year. You can stop the renewal at any time in Asteria (menu → Support Asteria) or through the link in your receipt; you keep your benefits until the end of the year you paid for, and you can resume the renewal until then.
A single year: a membership year bought without renewal ends after one year and is not charged again.
Changing your amount: if a higher amount moves you to a higher tier, the difference for the rest of your current year is charged straight away, after you have seen and confirmed the exact amount. Any other change applies from your next renewal.
Failed payments: if a renewal payment fails, Paddle tries again. Your benefits continue for up to 14 days; if the payment still doesn't succeed, the membership ends.
Your account: a membership belongs to the Asteria account you bought it with. If you delete that account, the renewal is cancelled and the membership ends at once.
Changes to benefits: we may add features to a tier at any time. We will not reduce the benefits of a year you have already paid for; if a tier changes, the change applies from your next renewal and we tell you beforehand.

5. Refunds

You get a full refund within 14 days of any payment, no questions asked. See the refund policy.

6. Availability and changes

We work to keep Asteria available and to improve it, but we can't promise it will always be available or error-free, and we may change, add or remove free features. If we ever stop Asteria, paying supporters get a proportional refund of the time they have paid for and not yet used.

7. Liability

As far as the law allows, we are not liable for indirect damage, and our total liability is limited to the amount you paid us in the 12 months before the damage occurred. Nothing in these terms limits liability that cannot be limited by law, or your rights as a consumer.

8. Changes to these terms

We may update these terms. If a change matters for supporters, we announce it at least 30 days in advance; it then applies from your next renewal, and you can stop your renewal before then. The date at the top shows the latest version.

9. Law and disputes

Dutch law applies to these terms. If you live in another country, you keep the protection that the consumer law of that country gives you. Please contact us first if you have a complaint; we will try to resolve it with you.