An occultation is when the moon passes between the Earth and a given star or planet, obstructing that celestial body's visibility. These obstructions happen somewhat regularly and can easily be planned around since their occurrence is predictable. Occultations may be visible from some locations on Earth and not from others. Check in advance to see whether an occultation is scheduled and whether your visibility will be significantly affected. You can find out about planned occultations by searching online or by consulting an astronomy guide. The International Occultation Timing Association publishes their predictions online for free. Light reflected off the moon can inhibit your ability to see stars and planets. If it is close to a full moon, you may have a hard time observing celestial bodies. For this reason, it's best to check on the current phase of the moon before venturing out to observe the night sky. If you aren't sure about the moon's current phase, you can consult an online guide to the moon's phases for free. The U.S. Navy's website allows you to check moon phases by date as far in advance as the year 2100. Knowing how to distinguish between stars and planets will only get you so far if the night sky is not very visible. Your ability to see celestial bodies can be limited by a number of factors, both man-made and naturally-occurring. Light pollution is one of the biggest limiting factors of night sky visibility. If you live in or near a metropolitan area, you will probably need to travel to a more rural area to increase visibility. Cloud cover and significant snow cover can both affect night sky visibility. If it's very cloudy or if the ground is significantly covered in snow, you may have a hard time seeing celestial bodies in the sky. There are many other factors can also affect night sky visibility, including some that you might be inflicting upon yourself. For example, your level of alcohol consumption, your nicotine consumption, and your pupil dilation at the time of viewing can all affect your ability to see celestial bodies. These factors all affect your eyes' ability to adjust to the dark and identify stars and planets in the night sky.
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One-sentence summary -- Check whether an occultation is scheduled. Identify the moon's phase. Find the right conditions. Avoid other limiting factors.

Before you provide any services or goods, contract with your customer so they understand what they are responsible for paying and when. Make sure all document language is clear. Discuss the account with the customer so you can be sure they are familiar with any charged amounts and due dates. Payment terms need to be agreed on by both parties. Consider adopting a late payment fee to encourage on-time payments. You may choose to charge a percentage of the total bill when payments become delinquent2% is typical. Make sure all late fee policies are included in your contract or payment policy. You may prefer to ask for at least 50% of payment upfront. This ensures you at least receive something in exchange for your time and efforts. Do research about collecting interest. Federal and state laws regulate the collection of interest on debts. Always make sure that any interest you charge is lawful and included in your payment policy to avoid debt forfeiture or a fine. You can check usa.gov for your state's usury laws. You can also check your state's attorney general website for information on legal interest rates and legal practices in your state. Some invoices state, "payment due upon receipt." You may also use "net 15 days," "net 30 days" or any other period of time in which you expect someone to remit payment. Placing a due date on a bill encourages your customer to include it in a current or upcoming billing cycle. If you do not place a due date on the bill, the business or individual may wait a month or two before paying, especially if bills are tight. Don't wait 30 days from the date of service or delivery of the product to send out a bill. Bill every 15 to 30 days. The sooner you send out the bill, the more likely you will get paid sooner. When a payment becomes past due, immediately send a reminder noting the amount owed as well as the fact that payment is now past due. Many customers are so busy that they simply forget a bill hasn't been paid. They will often pay it as soon as they realize payment is past due. Keep a record of all contact with the debtor. You will need the dates and times of your calls, letters and any other communication about the late payment, in case of legal action. You may also need to address this information when you contact the debtor. Make sure you have relevant contact information, such as address, telephone number and extension number, if available.It is also good to check in with your business contacts regularly. Engaged business relationships promote a mutual desire to fulfill transactions. Address each bill directly to the person who makes financial decisions in a business or the person responsible for the account. If you don't have a contact for a business transaction, you can usually call the front desk and be connected to Accounts Payable. You will need to decide what happens when payments are late. Generally, you first send out a reminder, then call the customer or business that is late with a payment, follow up, try to negotiate and then take it to collections or pursue legal action if the debt remains unpaid. Everyone in your company should understand the process so they know where to direct those who owe debts when they reach out to you.
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One-sentence summary --
Develop a payment policy. List the due date on every bill you send. Send reminder bills. Keep a contact with each company or customer. Create a procedure for dealing with debts.