Our comprehensive research to obtain repeatability of results discovered that some days, and hours of the day, are better than others for recording raw data in the field.  This research led us to our proprietary software Etide.  Etide uses the scientifically documented solar-lunar cycles, and their known effects on the earth, as well as the manually entered specific coordinates of the prospective work areas. (Fig. 1)  The results are shown in tables of positive and negative microgals of the gravity fields of the earth in 5 minute increments, 24 hours a day, 7 days a week. Investigating further, using this information, we found that optimum data recording window(s) of +/- 3 to 7 days per month exist in each general area of specific coordinates. All things considered, this will allow for repeatability from month to month and year to year.  Therefore, to insure this repeatability, we only record the raw data on these specific solar-lunar cycles.  This results in approximately 56 optimum days per year for data acquisition in the field within specific coordinates. (Fig. 2)  Factoring in the weather, you can lose up to 40% of these optimum recording days in any given location. Our goal is to provide the most accurate picture of hydrocarbon accumulation (if any) in your area of interest for drilling purposes. Repeatability Reeves Technology Corporation 498 Curtis Road  -  Burleson, TX 76028 817-447-8056 samreeves@reevestech.com * The highlighted dates are an approximation and are for the Burleson, Texas area only.  The dates can move depending on your location.  Please call for your exact dates. click thumbnail to enlarge * Fig. 2 Fig. 1